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Commitments and Contingencies - Leases (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Operating Leased Assets
Operating leases, rent expense	$ 1,450	$ 1,683
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2013	1,539
2014	2,483
2015	1,884
2016	1,667
2017	849
Thereafter	77
Total	8,499
January 1, 2015 to December 31, 2016
Operating Leased Assets
Operating leases, purchase option price	8,400
Year ending December 2017
Operating Leased Assets
Operating leases, purchase option price	8,600
Year ending December 2018
Operating Leased Assets
Operating leases, purchase option price	$ 8,800

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