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Financial and Other Guarantees Level 4 (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012	Mar. 31, 2012
Guarantor Obligations [Line Items]
Deferred Revenue, Current	$ 43,600	$ 43,252
Product Warranty Accrual	12,714	11,189
Product Warranty Accrual, Warranties Issued	9,926
Standard Product Warranty Accrual, Payments	$ (8,401)

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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