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Intangibles, net - Intangibles included in other assets on the balance sheet (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2020	Oct. 26, 2019	Oct. 31, 2020	Oct. 26, 2019	Apr. 30, 2020
Intangibles, net
Intangibles, gross	$ 17,770		$ 17,770		$ 17,770
Less accumulated amortization	(5,557)		(5,557)		(4,133)
Intangibles, net	12,213		12,213		$ 13,637
Amortization expense	715	$ 755	$ 1,424	$ 1,327
Weighted average
Intangibles, net
Weighted average amortization period			4 years		4 years
Technology
Intangibles, net
Intangibles, gross	14,950		$ 14,950		$ 14,950
Licenses
Intangibles, net
Intangibles, gross	1,006		1,006		1,006
Customer relationships
Intangibles, net
Intangibles, gross	873		873		873
In-process research and development
Intangibles, net
Intangibles, gross	550		550		550
Non-compete agreements
Intangibles, net
Intangibles, gross	320		320		320
Trademarks and tradenames
Intangibles, net
Intangibles, gross	68		68		68
Other
Intangibles, net
Intangibles, gross	$ 3		$ 3		$ 3

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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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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