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Commitments and Contingencies - Leases (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Operating Leased Assets
Operating leases, rent expense	$ 724	$ 718
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2014	2,891
2015	2,151
2016	1,858
2017	968
2018	180
Thereafter	26
Total	8,074
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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