UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS - 6 months ended Sep. 30, 2015 - 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, 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	$ 1	8,835	0	0	0	0	8,836
Issuance of common stock, shares			93,769
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	(28)	(28)
Common stock dividends		0	0	0	(23,746)	0	0	0	(23,746)
Currency translation adjustments	$ (571)	102	0	0	0	0	0	469	469
Net income (loss)	(47,309)	2,704	0	0	(50,389)	0	0	376	(50,013)
Accretion of redeemable noncontrolling interests		(1,498)	0	0	(1,498)	0	0	0	(1,498)
Other comprehensive income (loss)	(3,771)	0	0	0	0	(3,771)	0	0	(3,771)
Redeemable noncontrolling interest, ending balance at Sep. 30, 2015		$ 30,527
Stockholders' equity, ending balance at Sep. 30, 2015	$ 1,547,035		$ 377	$ 788,672	$ 1,208,809	$ (274,100)	$ (184,796)	$ 8,073	$ 1,547,035
Common stock, shares, ending balance at Sep. 30, 2015	34,932,143		34,932,143