CONSOLIDATED STATEMENT OF STOCKHOLDERS' INVESTMENT (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Total stockholders' investment, beginning balance, value	$ 1,756,586	$ 1,610,957	$ 1,521,824
Common stock, shares outstanding, beginning balance	35,708,469us-gaap_CommonStockSharesOutstanding	36,150,639us-gaap_CommonStockSharesOutstanding	35,755,317us-gaap_CommonStockSharesOutstanding
Issuance of common stock	22,197	33,014	28,259
Issuance of common stock, shares	290,754	601,405	420,031
Correction of historical shares outstanding	0	0
Correction of historical shares outstanding, shares	91	300
Acquisition of noncontrolling interests	(3,170)	(2,078)
Distributions paid to noncontrolling interests	(59)	(57)	(63)
Repurchase of common stock	(80,831)	(77,661)	(1,219)
Repurchases of common stock, shares	(1,160,940)us-gaap_TreasuryStockSharesAcquired	(1,043,875)us-gaap_TreasuryStockSharesAcquired	(24,709)us-gaap_TreasuryStockSharesAcquired
Common stock dividends	(45,078)us-gaap_DividendsCommonStockCash	(36,320)us-gaap_DividendsCommonStockCash	(28,734)us-gaap_DividendsCommonStockCash
Currency translation adjustments	(2,392)	(1,554)	(341)
Net income	85,356	187,108	131,675
Other comprehensive income	(113,823)	43,177	(40,444)
Total stockholders' investment, ending balance, value	1,618,786	1,756,586	1,610,957
Common stock, shares outstanding, ending balance	34,838,374us-gaap_CommonStockSharesOutstanding	35,708,469us-gaap_CommonStockSharesOutstanding	36,150,639us-gaap_CommonStockSharesOutstanding
Temporary equity, foreign currency translation adjustments	2,800	500
Temporary equity, net income	3,400us-gaap_TemporaryEquityNetIncome	700us-gaap_TemporaryEquityNetIncome
Common Stock [Member]
Total stockholders' investment, beginning balance, value	373	367	363
Issuance of common stock	3	6	4
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	0	0
Distributions paid to noncontrolling interests	0	0	0
Repurchase of common stock	0	0	0
Common stock dividends	0	0	0
Currency translation adjustments	0	0	0
Net income	0	0	0
Other comprehensive income	0	0	0
Total stockholders' investment, ending balance, value	376	373	367
Additional Paid-in Capital [Member]
Total stockholders' investment, beginning balance, value	762,813	731,883	703,628
Issuance of common stock	22,194	33,008	28,255
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	(3,170)	(2,078)
Distributions paid to noncontrolling interests	0	0	0
Repurchase of common stock	0	0	0
Common stock dividends	0	0	0
Currency translation adjustments	0	0	0
Net income	0	0	0
Other comprehensive income	0	0	0
Total stockholders' investment, ending balance, value	781,837	762,813	731,883
Retained Earnings [Member]
Total stockholders' investment, beginning balance, value	1,245,220	1,094,803	993,435
Issuance of common stock	0	0	0
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	0	0
Distributions paid to noncontrolling interests	0	0	0
Repurchase of common stock	0	0	0
Common stock dividends	(45,078)	(36,320)	(28,734)
Currency translation adjustments	0	0	0
Net income	84,300	186,737	130,102
Other comprehensive income	0	0	0
Total stockholders' investment, ending balance, value	1,284,442	1,245,220	1,094,803
Accumulated other comprehensive income (loss) [Member]
Total stockholders' investment, beginning balance, value	(156,506)	(199,683)	(159,239)
Issuance of common stock	0	0	0
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	0	0
Distributions paid to noncontrolling interests	0	0	0
Repurchase of common stock	0	0	0
Common stock dividends	0	0	0
Currency translation adjustments	0	0	0
Net income	0	0	0
Other comprehensive income	(113,823)	43,177	(40,444)
Total stockholders' investment, ending balance, value	(270,329)	(156,506)	(199,683)
Treasury Stock [Member]
Total stockholders' investment, beginning balance, value	(103,965)	(26,304)	(25,085)
Issuance of common stock	0	0	0
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	0	0
Distributions paid to noncontrolling interests	0	0	0
Repurchase of common stock	(80,831)	(77,661)	(1,219)
Common stock dividends	0	0	0
Currency translation adjustments	0	0	0
Net income	0	0	0
Other comprehensive income	0	0	0
Total stockholders' investment, ending balance, value	(184,796)	(103,965)	(26,304)
Noncontrolling Interest [Member]
Total stockholders' investment, beginning balance, value	8,651	9,891	8,722
Issuance of common stock	0	0	0
Correction of historical shares outstanding	0	0
Acquisition of noncontrolling interests	0	0
Distributions paid to noncontrolling interests	(59)	(57)	(63)
Repurchase of common stock	0	0	0
Common stock dividends	0	0	0
Currency translation adjustments	(2,392)	(1,554)	(341)
Net income	1,056	371	1,573
Other comprehensive income	0	0	0
Total stockholders' investment, ending balance, value	$ 7,256	$ 8,651	$ 9,891

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