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Intangibles, net - Intangibles included in other assets on the balance sheet (Details) - USD ($)	3 Months Ended		12 Months Ended
	Aug. 01, 2020	Jul. 27, 2019	Apr. 30, 2020
Intangibles, net
Intangibles, gross	$ 17,770,000		$ 17,770,000
Less accumulated amortization	(4,842,000)		(4,133,000)
Intangibles, net	12,928,000		$ 13,637,000
Amortization expense	$ 709,000	$ 552,000
Weighted average
Intangibles, net
Weighted average amortization period	4 years		4 years
Technology
Intangibles, net
Intangibles, gross	$ 14,950,000		$ 14,950,000
Licenses
Intangibles, net
Intangibles, gross	1,006,000		1,006,000
Customer relationships
Intangibles, net
Intangibles, gross	873,000		873,000
In-process research and development
Intangibles, net
Intangibles, gross	550,000		550,000
Non-compete agreements
Intangibles, net
Intangibles, gross	320,000		320,000
Trademarks and tradenames
Intangibles, net
Intangibles, gross	68,000		68,000
Other
Intangibles, net
Intangibles, gross	$ 3,000		$ 3,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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