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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 02, 2015	Apr. 26, 2014	Apr. 27, 2013
Operating Leased Assets
Operating leases, rent expense	$ 2,714	$ 2,742	$ 2,749
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2014	2,490
2015	1,324
2016	325
2017	68
2018	38
Thereafter	0
Total	4,245
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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