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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Net sales:
Net sales	$ 127,755	$ 115,069	$ 172,692	$ 154,188	$ 138,177	$ 130,316	$ 169,309	$ 172,728	$ 569,704	$ 610,530	$ 586,539
Long-lived assets:
Long-lived assets	65,314				68,059				65,314	68,059	66,749
United States
Net sales:
Net sales									460,099	501,646	485,044
Long-lived assets:
Long-lived assets	59,192				61,206				59,192	61,206	62,425
Outside United States
Net sales:
Net sales									109,605	108,884	101,495
Long-lived assets:
Long-lived assets	$ 6,122				$ 6,853				$ 6,122	$ 6,853	$ 4,324

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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