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Commitments and Contingencies - Leases (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 28, 2012	Jul. 30, 2011
Operating Leased Assets
Operating leases, rent expense	$ 718	$ 856
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2013	2,300
2014	2,334
2015	1,787
2016	1,605
2017	803
Thereafter	75
Total	8,904
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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