Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details)

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Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Components of comprehensive income (loss)          
Net income (loss) $ (24,921) $ 14,318 $ (42,674) $ 46,167  
Currency translation gain (loss) 3,907 (11,592) (4,059) (8,487)  
Total comprehensive income (loss) (22,490) 2,735 (48,036) 37,735  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets          
Foreign currency translation gain 14,048   14,048   18,107
Total Accumulated other comprehensive income 6,658   6,658   12,020
Defined benefit pension plans
         
Components of comprehensive income (loss)          
Amortization of defined benefit pension and postretirement benefit plans (1,244) 100 (1,142) 216  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets          
Defined benefit postretirement plan and defined benefit pension plans adjustments (9,224)   (9,224)   (8,082)
Defined benefit postretirement pension plan
         
Components of comprehensive income (loss)          
Amortization of defined benefit pension and postretirement benefit plans (232) (91) (161) (161)  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets          
Defined benefit postretirement plan and defined benefit pension plans adjustments $ 1,834   $ 1,834   $ 1,995