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Financial and Other Guarantees (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Guarantor Obligations [Line Items]      
Product Warranty Accrual $ 7,509 $ 6,070 $ 7,573
Product Warranty Accrual, Warranties Issued 19,944 11,185 8,706
Standard Product Warranty Accrual, Payments (16,264) (9,746) (10,209)
Product Warranty Accrual 11,189 7,509 6,070
Deferred Revenue, Current $ 43,252 $ 28,230