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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 02, 2019	Oct. 27, 2018	Nov. 02, 2019	Oct. 27, 2018	Apr. 27, 2019
Net sales:
Net sales	$ 174,911	$ 172,692	$ 355,167	$ 326,880
Long-lived assets:
Long-lived assets	67,163		67,163		$ 65,314
United States
Net sales:
Net sales	147,106	145,936	296,566	267,261
Long-lived assets:
Long-lived assets	59,655		59,655		59,192
Outside United States
Net sales:
Net sales	27,805	$ 26,756	58,601	$ 59,619
Long-lived assets:
Long-lived assets	$ 7,508		$ 7,508		$ 6,122

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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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