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Commitments and Contingencies (Product Warranties) (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
Commitments And Contingencies Product Warranties Details
Balance at beginning of period		$ 378	$ 387	$ 362
Accruals for warranties	105	130	276	268
Settlements	(134)	(117)	(287)	(239)
Balance at end of period	$ 376	$ 391	$ 376	$ 391

- 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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