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		<nameOfIssuer>AAON INC</nameOfIssuer>
		<titleOfClass>COM PAR $0.004</titleOfClass>
		<cusip>000360206</cusip>
		<value>17404</value>
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		<nameOfIssuer>ACCENTURE PLC IRELAND</nameOfIssuer>
		<titleOfClass>SHS CLASS A</titleOfClass>
		<cusip>G1151C101</cusip>
		<value>50471</value>
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			<None>161021</None>
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		<nameOfIssuer>ACI WORLDWIDE INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>004498101</cusip>
		<value>24074</value>
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			<sshPrnamt>1151845</sshPrnamt>
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			<Sole>1041803</Sole>
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			<None>110042</None>
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		<nameOfIssuer>ACUITY BRANDS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>00508Y102</cusip>
		<value>145577</value>
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			<None>26976</None>
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		<nameOfIssuer>ADOBE SYSTEMS INCORPORATED</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>00724F101</cusip>
		<value>121680</value>
		<shrsOrPrnAmt>
			<sshPrnamt>442150</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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			<Sole>149683</Sole>
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			<None>292467</None>
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		<nameOfIssuer>ADVANCED DRAIN SYS INC DEL</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>00790R104</cusip>
		<value>72784</value>
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			<sshPrnamt>585224</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>569968</Sole>
			<Shared>0</Shared>
			<None>15256</None>
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		<nameOfIssuer>AFFILIATED MANAGERS GROUP IN</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>008252108</cusip>
		<value>272930</value>
		<shrsOrPrnAmt>
			<sshPrnamt>2440141</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>2377246</Sole>
			<Shared>0</Shared>
			<None>62895</None>
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		<nameOfIssuer>AGILENT TECHNOLOGIES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>00846U101</cusip>
		<value>102423</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>149815</Sole>
			<Shared>0</Shared>
			<None>692825</None>
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		<nameOfIssuer>AIR PRODS &amp; CHEMS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>009158106</cusip>
		<value>91788</value>
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		<votingAuthority>
			<Sole>67097</Sole>
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			<None>327302</None>
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		<nameOfIssuer>ALAMO GROUP INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>011311107</cusip>
		<value>26211</value>
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			<sshPrnamt>214371</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<Shared>0</Shared>
			<None>20956</None>
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		<nameOfIssuer>ALPHABET INC</nameOfIssuer>
		<titleOfClass>CAP STK CL C</titleOfClass>
		<cusip>02079K107</cusip>
		<value>439809</value>
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		<nameOfIssuer>AMERICAN TOWER CORP NEW</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>03027X100</cusip>
		<value>235571</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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			<None>794569</None>
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		<nameOfIssuer>AMETEK INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>031100100</cusip>
		<value>49876</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>211487</Sole>
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			<None>228301</None>
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		<nameOfIssuer>AMPHENOL CORP NEW</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>032095101</cusip>
		<value>191170</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>1980654</None>
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		<nameOfIssuer>AON PLC</nameOfIssuer>
		<titleOfClass>SHS CL A</titleOfClass>
		<cusip>G0403H108</cusip>
		<value>82602</value>
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			<sshPrnamt>308366</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>55619</Sole>
			<Shared>0</Shared>
			<None>252747</None>
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		<nameOfIssuer>APTARGROUP INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>038336103</cusip>
		<value>274082</value>
		<shrsOrPrnAmt>
			<sshPrnamt>2884168</sshPrnamt>
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		<nameOfIssuer>ARAMARK</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>03852U106</cusip>
		<value>421328</value>
		<shrsOrPrnAmt>
			<sshPrnamt>13504108</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>13155785</Sole>
			<Shared>0</Shared>
			<None>348323</None>
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		<nameOfIssuer>ARTISAN PARTNERS ASSET MGMT</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>04316A108</cusip>
		<value>26347</value>
		<shrsOrPrnAmt>
			<sshPrnamt>978343</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>100523</None>
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		<nameOfIssuer>AUTODESK INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>052769106</cusip>
		<value>32447</value>
		<shrsOrPrnAmt>
			<sshPrnamt>173700</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>82660</Sole>
			<Shared>0</Shared>
			<None>91040</None>
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		<nameOfIssuer>BALCHEM CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>057665200</cusip>
		<value>22617</value>
		<shrsOrPrnAmt>
			<sshPrnamt>186028</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>170941</Sole>
			<Shared>0</Shared>
			<None>15087</None>
		</votingAuthority>
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		<nameOfIssuer>BALL CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>058498106</cusip>
		<value>84890</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1756837</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>488707</Sole>
			<Shared>0</Shared>
			<None>1268130</None>
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		<nameOfIssuer>BEACON ROOFING SUPPLY INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>073685109</cusip>
		<value>58295</value>
		<shrsOrPrnAmt>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>958766</Sole>
			<Shared>0</Shared>
			<None>106566</None>
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		<nameOfIssuer>BIO-TECHNE CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>09073M104</cusip>
		<value>134187</value>
		<shrsOrPrnAmt>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>12780</None>
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		<nameOfIssuer>BLACK KNIGHT INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>09215C105</cusip>
		<value>230306</value>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3483937</Sole>
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			<None>74019</None>
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		<nameOfIssuer>BLACKBAUD INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>09227Q100</cusip>
		<value>156628</value>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3410310</Sole>
			<Shared>0</Shared>
			<None>144559</None>
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		<nameOfIssuer>BOOZ ALLEN HAMILTON HLDG COR</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>099502106</cusip>
		<value>291923</value>
		<shrsOrPrnAmt>
			<sshPrnamt>3161050</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3088303</Sole>
			<Shared>0</Shared>
			<None>72747</None>
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		<nameOfIssuer>BROADRIDGE FINL SOLUTIONS IN</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>11133T103</cusip>
		<value>173955</value>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1104051</Sole>
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			<None>101293</None>
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		<nameOfIssuer>BROWN &amp; BROWN INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>115236101</cusip>
		<value>366283</value>
		<shrsOrPrnAmt>
			<sshPrnamt>6056264</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>5915543</Sole>
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			<None>140721</None>
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		<nameOfIssuer>BURLINGTON STORES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>122017106</cusip>
		<value>99680</value>
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			<sshPrnamt>890871</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>870446</Sole>
			<Shared>0</Shared>
			<None>20425</None>
		</votingAuthority>
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		<nameOfIssuer>CACI INTL INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>127190304</cusip>
		<value>319929</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1225498</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1199054</Sole>
			<Shared>0</Shared>
			<None>26444</None>
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		<nameOfIssuer>CARLISLE COS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>142339100</cusip>
		<value>484206</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1726777</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1682844</Sole>
			<Shared>0</Shared>
			<None>43933</None>
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		<nameOfIssuer>CASEYS GEN STORES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>147528103</cusip>
		<value>183723</value>
		<shrsOrPrnAmt>
			<sshPrnamt>907184</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>885182</Sole>
			<Shared>0</Shared>
			<None>22002</None>
		</votingAuthority>
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		<nameOfIssuer>CBIZ INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>124805102</cusip>
		<value>51126</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1195082</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1065340</Sole>
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			<None>129742</None>
		</votingAuthority>
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		<nameOfIssuer>CDW CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>12514G108</cusip>
		<value>108048</value>
		<shrsOrPrnAmt>
			<sshPrnamt>692262</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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			<None>353872</None>
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		<nameOfIssuer>CENTRAL GARDEN &amp; PET CO</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>153527106</cusip>
		<value>22231</value>
		<shrsOrPrnAmt>
			<sshPrnamt>616848</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>556692</Sole>
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			<None>60156</None>
		</votingAuthority>
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		<nameOfIssuer>SCHWAB CHARLES CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>808513105</cusip>
		<value>86298</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1200752</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>201391</Sole>
			<Shared>0</Shared>
			<None>999361</None>
		</votingAuthority>
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		<nameOfIssuer>CHOICE HOTELS INTL INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>169905106</cusip>
		<value>297190</value>
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		<nameOfIssuer>COLUMBIA SPORTSWEAR CO</nameOfIssuer>
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		<cusip>198516106</cusip>
		<value>235074</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3384178</Sole>
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			<None>108744</None>
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			<sshPrnamt>339761</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>306631</Sole>
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			<None>33130</None>
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		<nameOfIssuer>COSTCO WHSL CORP NEW</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>22160K105</cusip>
		<value>63468</value>
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			<sshPrnamt>134389</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>24195</Sole>
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			<None>110194</None>
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		<nameOfIssuer>CROWN CASTLE INC</nameOfIssuer>
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		<cusip>22822V101</cusip>
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			<sshPrnamt>498695</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>88428</Sole>
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			<None>410267</None>
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		<nameOfIssuer>DANAHER CORPORATION</nameOfIssuer>
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			<sshPrnamt>1599383</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>500902</Sole>
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			<None>1098481</None>
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		<nameOfIssuer>DECKERS OUTDOOR CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>243537107</cusip>
		<value>129022</value>
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			<sshPrnamt>412725</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>403447</Sole>
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			<None>9278</None>
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		<nameOfIssuer>DIAGEO PLC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>193152</Sole>
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			<None>220675</None>
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		<nameOfIssuer>DOLBY LABORATORIES INC</nameOfIssuer>
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			<sshPrnamt>3737617</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3645737</Sole>
			<Shared>0</Shared>
			<None>91880</None>
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		<nameOfIssuer>DOLLAR GEN CORP NEW</nameOfIssuer>
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		<cusip>256677105</cusip>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>269443</Sole>
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			<None>724177</None>
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		<nameOfIssuer>DORMAN PRODS INC</nameOfIssuer>
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		<value>48598</value>
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			<sshPrnamt>591798</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>536680</Sole>
			<Shared>0</Shared>
			<None>55118</None>
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		<nameOfIssuer>ECOLAB INC</nameOfIssuer>
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		<cusip>278865100</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>398132</Sole>
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			<None>997808</None>
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		<nameOfIssuer>ELECTRONIC ARTS INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>114294</Sole>
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			<None>520297</None>
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		<nameOfIssuer>ENVESTNET INC</nameOfIssuer>
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		<cusip>29404K106</cusip>
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			<sshPrnamt>695601</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>630192</Sole>
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			<None>65409</None>
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		<nameOfIssuer>ENVISTA HOLDINGS CORPORATION</nameOfIssuer>
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		<cusip>29415F104</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>10194287</Sole>
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			<None>278242</None>
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		<nameOfIssuer>EPLUS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>294268107</cusip>
		<value>25188</value>
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			<sshPrnamt>606354</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>542860</Sole>
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			<None>63494</None>
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		<nameOfIssuer>LAUDER ESTEE COS INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>518439104</cusip>
		<value>98836</value>
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			<sshPrnamt>457785</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>79394</Sole>
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			<None>378391</None>
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		<nameOfIssuer>EXPONENT INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>330114</Sole>
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			<None>36974</None>
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		<nameOfIssuer>FACTSET RESH SYS INC</nameOfIssuer>
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			<sshPrnamt>322973</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>313626</Sole>
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			<None>9347</None>
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		<nameOfIssuer>FIDELITY NATL INFORMATION SV</nameOfIssuer>
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		<cusip>31620M106</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>161600</Sole>
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			<None>739359</None>
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		<nameOfIssuer>FISERV INC</nameOfIssuer>
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		<cusip>337738108</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>FORWARD AIR CORP</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>FRONTDOOR INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>FTI CONSULTING INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>620738</Sole>
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		<nameOfIssuer>GARTNER INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1050125</Sole>
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		<nameOfIssuer>GLOBAL PMTS INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>526332</Sole>
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			<None>557813</None>
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		<nameOfIssuer>GODADDY INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>692518</None>
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		<nameOfIssuer>GRACO INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>HAMILTON LANE INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>FULLER H B CO</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>377106</Sole>
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			<None>42720</None>
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		<nameOfIssuer>HENRY SCHEIN INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>34089</None>
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		<nameOfIssuer>HEXCEL CORP NEW</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>HOULIHAN LOKEY INC</nameOfIssuer>
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		<value>34978</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>417399</Sole>
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		<nameOfIssuer>HURON CONSULTING GROUP INC</nameOfIssuer>
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		<cusip>447462102</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>509336</Sole>
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			<None>57262</None>
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		<nameOfIssuer>IAA INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>ICU MED INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>318372</Sole>
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		<nameOfIssuer>IDEX CORP</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>IDEXX LABS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
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			<Sole>26756</Sole>
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			<None>123123</None>
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		<nameOfIssuer>INSIGHT ENTERPRISES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>45765U103</cusip>
		<value>43720</value>
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			<sshPrnamt>530516</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>475527</Sole>
			<Shared>0</Shared>
			<None>54989</None>
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		<nameOfIssuer>INTEGRA LIFESCIENCES HLDGS C</nameOfIssuer>
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		<cusip>457985208</cusip>
		<value>38171</value>
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			<sshPrnamt>901115</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>807330</Sole>
			<Shared>0</Shared>
			<None>93785</None>
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		<nameOfIssuer>INTER PARFUMS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>458334109</cusip>
		<value>64204</value>
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			<sshPrnamt>850838</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>761508</Sole>
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			<None>89330</None>
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		<nameOfIssuer>INTERCONTINENTAL EXCHANGE IN</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>45866F104</cusip>
		<value>198509</value>
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			<sshPrnamt>2197108</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>556502</Sole>
			<Shared>0</Shared>
			<None>1640606</None>
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		<nameOfIssuer>INTUIT</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>461202103</cusip>
		<value>123029</value>
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			<sshPrnamt>317641</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>92010</Sole>
			<Shared>0</Shared>
			<None>225631</None>
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		<nameOfIssuer>INTUITIVE SURGICAL INC</nameOfIssuer>
		<titleOfClass>COM NEW</titleOfClass>
		<cusip>46120E602</cusip>
		<value>25191</value>
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			<sshPrnamt>134394</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>24281</Sole>
			<Shared>0</Shared>
			<None>110113</None>
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		<nameOfIssuer>ISHARES TR</nameOfIssuer>
		<titleOfClass>RUS 1000 ETF</titleOfClass>
		<cusip>464287622</cusip>
		<value>10225</value>
		<shrsOrPrnAmt>
			<sshPrnamt>51815</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>327</Sole>
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			<None>51488</None>
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		<nameOfIssuer>ISHARES TR</nameOfIssuer>
		<titleOfClass>RUS 1000 GRW ETF</titleOfClass>
		<cusip>464287614</cusip>
		<value>848</value>
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			<sshPrnamt>4029</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>311</Sole>
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			<None>3718</None>
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		<nameOfIssuer>ISHARES TR</nameOfIssuer>
		<titleOfClass>RUSSELL 2000 ETF</titleOfClass>
		<cusip>464287655</cusip>
		<value>11134</value>
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			<sshPrnamt>67512</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>46102</Sole>
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			<None>21410</None>
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		<nameOfIssuer>J &amp; J SNACK FOODS CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>466032109</cusip>
		<value>43159</value>
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			<sshPrnamt>333353</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>298185</Sole>
			<Shared>0</Shared>
			<None>35168</None>
		</votingAuthority>
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		<nameOfIssuer>HENRY JACK &amp; ASSOC INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>426281101</cusip>
		<value>136013</value>
		<shrsOrPrnAmt>
			<sshPrnamt>746218</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>726485</Sole>
			<Shared>0</Shared>
			<None>19733</None>
		</votingAuthority>
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		<nameOfIssuer>HUNT J B TRANS SVCS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>445658107</cusip>
		<value>239926</value>
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			<sshPrnamt>1533858</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1491480</Sole>
			<Shared>0</Shared>
			<None>42378</None>
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		<nameOfIssuer>JONES LANG LASALLE INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>48020Q107</cusip>
		<value>209395</value>
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			<sshPrnamt>1386077</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1351804</Sole>
			<Shared>0</Shared>
			<None>34273</None>
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		<nameOfIssuer>KAR AUCTION SVCS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>48238T109</cusip>
		<value>15986</value>
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			<sshPrnamt>1431189</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1288700</Sole>
			<Shared>0</Shared>
			<None>142489</None>
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		<nameOfIssuer>KINSALE CAP GROUP INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>49714P108</cusip>
		<value>82203</value>
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			<sshPrnamt>321835</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>287112</Sole>
			<Shared>0</Shared>
			<None>34723</None>
		</votingAuthority>
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		<nameOfIssuer>KIRBY CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>497266106</cusip>
		<value>237315</value>
		<shrsOrPrnAmt>
			<sshPrnamt>3905135</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3757120</Sole>
			<Shared>0</Shared>
			<None>148015</None>
		</votingAuthority>
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		<nameOfIssuer>LABORATORY CORP AMER HLDGS</nameOfIssuer>
		<titleOfClass>COM NEW</titleOfClass>
		<cusip>50540R409</cusip>
		<value>40508</value>
		<shrsOrPrnAmt>
			<sshPrnamt>197784</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>33351</Sole>
			<Shared>0</Shared>
			<None>164433</None>
		</votingAuthority>
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		<nameOfIssuer>LANCASTER COLONY CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>513847103</cusip>
		<value>24001</value>
		<shrsOrPrnAmt>
			<sshPrnamt>159711</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>143179</Sole>
			<Shared>0</Shared>
			<None>16532</None>
		</votingAuthority>
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		<nameOfIssuer>LANDSTAR SYS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>515098101</cusip>
		<value>324534</value>
		<shrsOrPrnAmt>
			<sshPrnamt>2247933</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>2171429</Sole>
			<Shared>0</Shared>
			<None>76504</None>
		</votingAuthority>
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		<nameOfIssuer>LENNOX INTL INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>526107107</cusip>
		<value>244033</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1095940</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1069194</Sole>
			<Shared>0</Shared>
			<None>26746</None>
		</votingAuthority>
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		<nameOfIssuer>LINDE PLC</nameOfIssuer>
		<titleOfClass>SHS</titleOfClass>
		<cusip>G5494J103</cusip>
		<value>186177</value>
		<shrsOrPrnAmt>
			<sshPrnamt>690593</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>203167</Sole>
			<Shared>0</Shared>
			<None>487426</None>
		</votingAuthority>
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		<nameOfIssuer>LKQ CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>501889208</cusip>
		<value>280082</value>
		<shrsOrPrnAmt>
			<sshPrnamt>5940242</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>5804754</Sole>
			<Shared>0</Shared>
			<None>135488</None>
		</votingAuthority>
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		<nameOfIssuer>LOWES COS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>548661107</cusip>
		<value>88172</value>
		<shrsOrPrnAmt>
			<sshPrnamt>469473</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>84347</Sole>
			<Shared>0</Shared>
			<None>385126</None>
		</votingAuthority>
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		<nameOfIssuer>MANHATTAN ASSOCIATES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>562750109</cusip>
		<value>133728</value>
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			<sshPrnamt>1005247</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>974716</Sole>
			<Shared>0</Shared>
			<None>30531</None>
		</votingAuthority>
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		<nameOfIssuer>MARKEL CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>570535104</cusip>
		<value>434787</value>
		<shrsOrPrnAmt>
			<sshPrnamt>401014</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>346873</Sole>
			<Shared>0</Shared>
			<None>54141</None>
		</votingAuthority>
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		<nameOfIssuer>MARSH &amp; MCLENNAN COS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>571748102</cusip>
		<value>170246</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1140369</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>326097</Sole>
			<Shared>0</Shared>
			<None>814272</None>
		</votingAuthority>
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		<nameOfIssuer>MARTIN MARIETTA MATLS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>573284106</cusip>
		<value>65075</value>
		<shrsOrPrnAmt>
			<sshPrnamt>202039</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>99097</Sole>
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			<None>102942</None>
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		<nameOfIssuer>MASTERCARD INCORPORATED</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>57636Q104</cusip>
		<value>302953</value>
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			<sshPrnamt>1065460</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>285443</Sole>
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			<None>780017</None>
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		<nameOfIssuer>MCGRATH RENTCORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>580589109</cusip>
		<value>34461</value>
		<shrsOrPrnAmt>
			<sshPrnamt>410931</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>368610</Sole>
			<Shared>0</Shared>
			<None>42321</None>
		</votingAuthority>
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		<nameOfIssuer>MESA LABS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>59064R109</cusip>
		<value>23282</value>
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			<sshPrnamt>165321</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>148540</Sole>
			<Shared>0</Shared>
			<None>16781</None>
		</votingAuthority>
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		<nameOfIssuer>META PLATFORMS INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>30303M102</cusip>
		<value>24069</value>
		<shrsOrPrnAmt>
			<sshPrnamt>177396</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>177396</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
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		<nameOfIssuer>MICROSOFT CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>594918104</cusip>
		<value>321686</value>
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			<sshPrnamt>1381220</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>389307</Sole>
			<Shared>0</Shared>
			<None>991913</None>
		</votingAuthority>
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		<nameOfIssuer>MONRO INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>610236101</cusip>
		<value>25005</value>
		<shrsOrPrnAmt>
			<sshPrnamt>575358</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>516824</Sole>
			<Shared>0</Shared>
			<None>58534</None>
		</votingAuthority>
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		<nameOfIssuer>MOODYS CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>615369105</cusip>
		<value>55546</value>
		<shrsOrPrnAmt>
			<sshPrnamt>228480</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>41099</Sole>
			<Shared>0</Shared>
			<None>187381</None>
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	<infoTable>
		<nameOfIssuer>MOOG INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>615394202</cusip>
		<value>42953</value>
		<shrsOrPrnAmt>
			<sshPrnamt>610556</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>540321</Sole>
			<Shared>0</Shared>
			<None>70235</None>
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		<nameOfIssuer>MORNINGSTAR INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>617700109</cusip>
		<value>218606</value>
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			<sshPrnamt>1029605</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1000994</Sole>
			<Shared>0</Shared>
			<None>28611</None>
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		<nameOfIssuer>NATIONAL INSTRS CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>636518102</cusip>
		<value>33357</value>
		<shrsOrPrnAmt>
			<sshPrnamt>883853</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>857883</Sole>
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			<None>101247</None>
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		<nameOfIssuer>NIKE INC</nameOfIssuer>
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			<sshPrnamt>733655</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>131206</Sole>
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			<None>602449</None>
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		<nameOfIssuer>NORDSON CORP</nameOfIssuer>
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			<sshPrnamt>898691</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>873178</Sole>
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			<None>25513</None>
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		<nameOfIssuer>OREILLY AUTOMOTIVE INC</nameOfIssuer>
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		<cusip>67103H107</cusip>
		<value>229193</value>
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			<sshPrnamt>325859</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>93428</Sole>
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			<None>232431</None>
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		<nameOfIssuer>PATTERSON COS INC</nameOfIssuer>
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			<sshPrnamt>632177</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>573458</Sole>
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			<None>58719</None>
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		<nameOfIssuer>PAYPAL HLDGS INC</nameOfIssuer>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>153670</Sole>
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			<None>696886</None>
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		<nameOfIssuer>PERFICIENT INC</nameOfIssuer>
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			<sshPrnamt>576590</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>517034</Sole>
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			<None>59556</None>
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		<nameOfIssuer>PINNACLE FINL PARTNERS INC</nameOfIssuer>
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			<sshPrnamt>257024</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>231053</Sole>
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			<None>25971</None>
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		<nameOfIssuer>POOL CORP</nameOfIssuer>
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			<sshPrnamt>406280</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>396007</Sole>
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			<None>10273</None>
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		<nameOfIssuer>POWER INTEGRATIONS INC</nameOfIssuer>
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		<value>29731</value>
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			<sshPrnamt>462242</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>418271</Sole>
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			<None>43971</None>
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		<nameOfIssuer>PROSPERITY BANCSHARES INC</nameOfIssuer>
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			<sshPrnamt>2309375</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>2249990</Sole>
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			<None>59385</None>
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		<nameOfIssuer>QUALYS INC</nameOfIssuer>
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		<cusip>74758T303</cusip>
		<value>72762</value>
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			<sshPrnamt>522005</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>465191</Sole>
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			<None>56814</None>
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		<nameOfIssuer>RLI CORP</nameOfIssuer>
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		<cusip>749607107</cusip>
		<value>35018</value>
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			<sshPrnamt>342037</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>307076</Sole>
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			<None>34961</None>
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		<nameOfIssuer>ROSS STORES INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>778296103</cusip>
		<value>79054</value>
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			<sshPrnamt>938100</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>455078</Sole>
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			<None>483022</None>
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		<nameOfIssuer>RPM INTL INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>749685103</cusip>
		<value>348697</value>
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			<sshPrnamt>4185536</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>4084644</Sole>
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			<None>100892</None>
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		<nameOfIssuer>S&amp;P GLOBAL INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>78409V104</cusip>
		<value>213371</value>
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			<sshPrnamt>698774</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>197887</Sole>
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			<None>500887</None>
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		<nameOfIssuer>SALLY BEAUTY HLDGS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>79546E104</cusip>
		<value>17634</value>
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			<sshPrnamt>1399562</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1255715</Sole>
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			<None>143847</None>
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		<nameOfIssuer>SEI INVTS CO</nameOfIssuer>
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		<value>291726</value>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>5804438</Sole>
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			<None>143095</None>
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		<nameOfIssuer>SELECTIVE INS GROUP INC</nameOfIssuer>
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		<cusip>816300107</cusip>
		<value>64224</value>
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			<sshPrnamt>788993</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>706068</Sole>
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			<None>82925</None>
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		<nameOfIssuer>SERVICE CORP INTL</nameOfIssuer>
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		<value>126166</value>
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			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>2129974</Sole>
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			<None>55102</None>
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		<nameOfIssuer>SHERWIN WILLIAMS CO</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>824348106</cusip>
		<value>37037</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>85227</Sole>
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			<None>95664</None>
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		<nameOfIssuer>SILGAN HOLDINGS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>827048109</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>SIMPSON MFG INC</nameOfIssuer>
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		<cusip>829073105</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>SOUTHSTATE CORPORATION</nameOfIssuer>
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			<sshPrnamt>462281</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>SPROUTS FMRS MKT INC</nameOfIssuer>
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		<cusip>85208M102</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>STARBUCKS CORP</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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			<None>879295</None>
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		<nameOfIssuer>STEPAN CO</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>188598</Sole>
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		<nameOfIssuer>STERIS PLC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>TE CONNECTIVITY LTD</nameOfIssuer>
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		<cusip>H84989104</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>TECHTARGET INC</nameOfIssuer>
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		<cusip>87874R100</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>519986</Sole>
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		<nameOfIssuer>TELEFLEX INCORPORATED</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1243557</Sole>
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		<nameOfIssuer>TERMINIX GLOBAL HOLDINGS INC</nameOfIssuer>
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		<cusip>88087E100</cusip>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>TEXAS INSTRS INC</nameOfIssuer>
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		<cusip>882508104</cusip>
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		<votingAuthority>
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		<nameOfIssuer>THERMO FISHER SCIENTIFIC INC</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>TJX COS INC NEW</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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		<nameOfIssuer>TRANSUNION</nameOfIssuer>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>ULTA BEAUTY INC</nameOfIssuer>
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		<nameOfIssuer>UMPQUA HLDGS CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>904214103</cusip>
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			<sshPrnamt>9028916</sshPrnamt>
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			<Sole>8665867</Sole>
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		<nameOfIssuer>UNIFIRST CORP MASS</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>904708104</cusip>
		<value>40546</value>
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			<sshPrnamt>241018</sshPrnamt>
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			<Sole>216072</Sole>
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			<None>24946</None>
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		<nameOfIssuer>VERISK ANALYTICS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>92345Y106</cusip>
		<value>320604</value>
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			<sshPrnamt>1880046</sshPrnamt>
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		<nameOfIssuer>VISA INC</nameOfIssuer>
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		<cusip>92826C839</cusip>
		<value>391092</value>
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			<sshPrnamt>2201475</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
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		<nameOfIssuer>WESTAMERICA BANCORPORATION</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>957090103</cusip>
		<value>21215</value>
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		<nameOfIssuer>WEX INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>96208T104</cusip>
		<value>208801</value>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
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		<nameOfIssuer>WHITE MTNS INS GROUP LTD</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>G9618E107</cusip>
		<value>166093</value>
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			<sshPrnamt>127468</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>57964</Sole>
			<Shared>0</Shared>
			<None>69504</None>
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		<nameOfIssuer>WOLVERINE WORLD WIDE INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>978097103</cusip>
		<value>31138</value>
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			<sshPrnamt>2023250</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1813688</Sole>
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			<None>209562</None>
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		<nameOfIssuer>WOODWARD INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>980745103</cusip>
		<value>113757</value>
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			<sshPrnamt>1417354</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1387207</Sole>
			<Shared>0</Shared>
			<None>30147</None>
		</votingAuthority>
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		<nameOfIssuer>BERKLEY W R CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>084423102</cusip>
		<value>582845</value>
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			<sshPrnamt>9025165</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>8760626</Sole>
			<Shared>0</Shared>
			<None>264539</None>
		</votingAuthority>
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		<nameOfIssuer>XYLEM INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>98419M100</cusip>
		<value>169512</value>
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			<sshPrnamt>1940390</sshPrnamt>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>557999</Sole>
			<Shared>0</Shared>
			<None>1382391</None>
		</votingAuthority>
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		<nameOfIssuer>ZOETIS INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>98978V103</cusip>
		<value>234334</value>
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			<sshPrnamt>1580244</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
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		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>440650</Sole>
			<Shared>0</Shared>
			<None>1139594</None>
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