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Financial and Other Guarantees Level 4 (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Dec. 31, 2011
Mar. 31, 2011
Guarantor Obligations [Line Items]    
Deferred Revenue, Current $ 37,200 $ 24,655
Product Warranty Accrual 10,234 7,509
Product Warranty Accrual, Warranties Issued 5,624  
Standard Product Warranty Accrual, Payments $ (2,899)