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Commitments and Contingencies - Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Operating Leased Assets
Operating leases, rent expense	$ 2,749	$ 3,159	$ 3,738
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2014	2,840
2015	2,096
2016	1,832
2017	968
2018	191
Thereafter	30
Total	7,957
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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