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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Operating Leased Assets
Operating leases, rent expense	$ 3,477	$ 3,175	$ 3,031
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2019	2,795
2020	2,220
2021	1,888
2022	1,510
2023	249
Thereafter	297
Total	8,959
March 31, 2017 to March 31, 2022
Operating Leased Assets
Operating leases, purchase option price	9,000
Year ending March 2023
Operating Leased Assets
Operating leases, purchase option price	9,090
Year ending March 2024
Operating Leased Assets
Operating leases, purchase option price	$ 9,180

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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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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 fourth 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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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 second 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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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 remainder of the 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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