UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests	Total Stockholders' Investment
Redeemable noncontrolling interest, beginning balance at Mar. 31, 2014		$ 22,283
Stockholders' equity, beginning balance at Mar. 31, 2014			$ 373	$ 762,813	$ 1,245,220	$ (156,506)	$ (103,965)	$ 8,651	$ 1,756,586
Common stock, shares beginning balance at Mar. 31, 2014			35,708,469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, value		0	$ 1	5,105	0	0	0	0	5,106
Issuance of common stock, shares			120,402
Distributions paid to noncontrolling interests		0	$ 0	0	0	0	0	(15)	(15)
Repurchases of common stock, value		0	$ 0	0	0	0	(20,157)	0	(20,157)
Repurchases of common stock, shares	(270,598)		(270,598)
Common stock dividends		0	$ 0	0	(11,353)	0	0	0	(11,353)
Currency translation adjustments	$ 971	586	0	0	0	0	0	385	385
Net income	45,003	1,376	0	0	44,109	0	0	(482)	43,627
Other comprehensive income		0	0	0	0	9,208	0	0	9,208
Redeemable noncontrolling interest, ending balance at Jun. 30, 2014		24,245
Stockholders' equity, ending balance at Jun. 30, 2014			$ 374	767,918	1,277,976	(147,298)	(124,122)	8,539	1,783,387
Common stock, shares ending balance at Jun. 30, 2014			35,558,273
Redeemable noncontrolling interest, beginning balance at Mar. 31, 2015		26,223
Stockholders' equity, beginning balance at Mar. 31, 2015	$ 1,618,786		$ 376	781,837	1,284,442	(270,329)	(184,796)	7,256	1,618,786
Common stock, shares beginning balance at Mar. 31, 2015	34,838,374		34,838,374
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, value		0	$ 0	2,783	0	0	0	0	2,783
Issuance of common stock, shares			80,285
Acquisition of noncontrolling interests		0	$ 0	(2,000)	0	0	0	0	(2,000)
Distributions paid to noncontrolling interests		0	0	0	0	0	0	(14)	(14)
Repurchases of common stock, shares	0
Common stock dividends		0	0	0	(11,871)	0	0	0	(11,871)
Currency translation adjustments	$ 2,106	1,432	0	0	0	0	0	674	674
Net income	(1,629)	1,386	0	0	(3,257)	0	0	242	(3,015)
Accretion of noncontrolling interests		6,301	0	0	(6,301)	0	0	0	(6,301)
Other comprehensive income	14,714	0	0	0	0	14,714	0	0	14,714
Redeemable noncontrolling interest, ending balance at Jun. 30, 2015		$ 35,342
Stockholders' equity, ending balance at Jun. 30, 2015	$ 1,613,756		$ 376	$ 782,620	$ 1,263,013	$ (255,615)	$ (184,796)	$ 8,158	$ 1,613,756
Common stock, shares ending balance at Jun. 30, 2015	34,918,659		34,918,659