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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2015	Nov. 01, 2014
Operating Leased Assets
Operating leases, rent expense	$ 1,311	$ 1,392
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2015	1,330
2016	1,573
2017	473
2018	85
2019	38
Total	3,499
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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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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