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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Operating Leased Assets
Operating leases, rent expense	$ 3,495	$ 3,477	$ 3,175
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity
2020	3,038
2021	2,510
2022	1,608
2023	269
2024	193
Thereafter	101
Total	7,719
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 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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