Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (115,873)	$ 28,806	$ (247,734)
Other comprehensive income (loss)
Foreign currency translation adjustment	4,288	(4,237)	(6,868)
Pension
Actuarial gain (loss), net of taxes of $962, ($692) and ($2,091)	1,386	(1,823)	(5,503)
Amounts reclassified into results of operations, net of taxes of $185, $104 and $39	283	273	99
Derivative instruments
Net change in fair value of cash flow hedges, net of taxes of ($744), ($142) and ($54)	(1,212)	(375)	(143)
Amounts reclassified into results of operations, net of taxes of $692, $136 and $59	1,125	357	154
Other comprehensive income (loss)	5,870	(5,805)	(12,261)
Comprehensive income (loss)	$ (110,003)	$ 23,001	$ (259,995)