Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of Stockholder's equity
Beginning Balance			$ 153,932
Net loss	(39,965)	(13,767)	(131,189)	(120,234)
Defined benefit plans, net	(484)	(325)	(418)	281
Translation adjustment			19,554
Common stock issuance/other			7,042
Stock compensation			1,711
Ending Balance	50,632		50,632
Common Stock [Member]
Components of Stockholder's equity
Beginning Balance			793
Common stock issuance/other			(2)
Ending Balance	791		791
Additional Paid-in Capital [Member]
Components of Stockholder's equity
Beginning Balance			1,139,030
Common stock issuance/other			3
Stock compensation			1,711
Ending Balance	1,140,744		1,140,744
Accumulated Deficit [Member]
Components of Stockholder's equity
Beginning Balance			(939,312)
Net loss			(131,310)
Common stock issuance/other			0
Ending Balance	(1,070,622)		(1,070,622)
Accumulated Other Comprehensive Income [Member]
Components of Stockholder's equity
Beginning Balance			(47,439)
Defined benefit plans, net			(418)
Translation adjustment			19,554
Common stock issuance/other			1
Ending Balance	(28,302)		(28,302)
Noncontrolling Interests [Member]
Components of Stockholder's equity
Beginning Balance			860
Net loss			121
Common stock issuance/other			7,040
Ending Balance	$ 8,021		$ 8,021