Condensed Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Net sales	$ 1,174,255us-gaap_SalesRevenueGoodsNet	$ 1,046,823us-gaap_SalesRevenueGoodsNet	$ 2,948,663us-gaap_SalesRevenueGoodsNet	$ 2,482,116us-gaap_SalesRevenueGoodsNet
Cost of products sold	1,007,654us-gaap_CostOfGoodsAndServicesSold	904,743us-gaap_CostOfGoodsAndServicesSold	2,562,397us-gaap_CostOfGoodsAndServicesSold	2,164,526us-gaap_CostOfGoodsAndServicesSold
Gross profit	166,601us-gaap_GrossProfit	142,080us-gaap_GrossProfit	386,266us-gaap_GrossProfit	317,590us-gaap_GrossProfit
Selling, general and administrative expenses	68,940	56,953	181,231	149,060
Amortization of intangible assets	3,950us-gaap_AmortizationOfIntangibleAssets	3,102us-gaap_AmortizationOfIntangibleAssets	11,606us-gaap_AmortizationOfIntangibleAssets	9,166us-gaap_AmortizationOfIntangibleAssets
Impairment charges				710
Interest income	287us-gaap_InvestmentIncomeInterest	314us-gaap_InvestmentIncomeInterest	994us-gaap_InvestmentIncomeInterest	1,215us-gaap_InvestmentIncomeInterest
Interest expense			1us-gaap_InterestExpense	7us-gaap_InterestExpense
Other income, net	563us-gaap_OtherNonoperatingIncomeExpense	409us-gaap_OtherNonoperatingIncomeExpense	982us-gaap_OtherNonoperatingIncomeExpense	1,229us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes	94,561	82,748	195,404	161,091
Income taxes	31,009us-gaap_IncomeTaxExpenseBenefit	27,623us-gaap_IncomeTaxExpenseBenefit	62,384us-gaap_IncomeTaxExpenseBenefit	52,354us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	63,552	55,125	133,020	108,737
Income (loss) from discontinued operations, net of income taxes	(707)	(3)	(2,602)	3,685
Net income	62,845us-gaap_NetIncomeLoss	55,122us-gaap_NetIncomeLoss	130,418us-gaap_NetIncomeLoss	112,422us-gaap_NetIncomeLoss
Weighted average common shares outstanding:
Basic	53,380,651	53,289,864	53,363,872	53,261,186
Diluted	53,495,499	53,385,364	53,461,470	53,345,644
Earnings per common share from continuing operations:
Basic	$ 1.19	$ 1.03	$ 2.49	$ 2.04
Diluted	$ 1.19	$ 1.03	$ 2.49	$ 2.04
Earnings (loss) per common share from discontinued operations:
Basic	$ (0.01)		$ (0.05)	$ 0.07
Diluted	$ (0.02)		$ (0.05)	$ 0.07
Earnings per common share:
Basic	$ 1.18us-gaap_EarningsPerShareBasic	$ 1.03us-gaap_EarningsPerShareBasic	$ 2.44us-gaap_EarningsPerShareBasic	$ 2.11us-gaap_EarningsPerShareBasic
Diluted	$ 1.17us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted	$ 2.44us-gaap_EarningsPerShareDiluted	$ 2.11us-gaap_EarningsPerShareDiluted
Net income	62,845us-gaap_NetIncomeLoss	55,122us-gaap_NetIncomeLoss	130,418us-gaap_NetIncomeLoss	112,422us-gaap_NetIncomeLoss
Unrealized appreciation on investments, net of income tax				22
Comprehensive income	$ 62,845us-gaap_ComprehensiveIncomeNetOfTax	$ 55,122us-gaap_ComprehensiveIncomeNetOfTax	$ 130,418us-gaap_ComprehensiveIncomeNetOfTax	$ 112,444us-gaap_ComprehensiveIncomeNetOfTax
Regular Dividend
Earnings per common share:
Dividends paid per common share	$ 0.27	$ 0.23	$ 0.81	$ 0.69
Special Dividend
Earnings per common share:
Dividends paid per common share				$ 1.00

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