Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Components of comprehensive income (loss)
Net income (loss)	$ (14,257)	$ (27,771)	$ (56,931)	$ 18,396
Currency translation gain (loss)	3,456	(5,854)	(603)	(14,341)
Total comprehensive income (loss)	(10,595)	(33,589)	(58,631)	4,146
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets
Foreign currency translation gain	17,504		17,504		18,107
Total Accumulated other comprehensive income	10,320		10,320		12,020
Defined benefit pension plans
Components of comprehensive income (loss)
Amortization of defined benefit pension and postretirement benefit plans	288	118	(854)	334
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets
Defined benefit postretirement plan and defined benefit pension plans adjustments	(8,936)		(8,936)		(8,082)
Defined benefit postretirement pension plan
Components of comprehensive income (loss)
Amortization of defined benefit pension and postretirement benefit plans	(82)	(82)	(243)	(243)
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets
Defined benefit postretirement plan and defined benefit pension plans adjustments	$ 1,752		$ 1,752		$ 1,995