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Intangibles (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Apr. 30, 2019
Intangibles
Intangibles, gross	$ 17,770,000		$ 17,770,000		$ 1,770,000
Less accumulated amortization	(3,413,000)		(3,413,000)		(1,311,000)
Intangibles, net	14,357,000		$ 14,357,000		$ 459,000
Weighted average amortization period			5 years		1 year
Amortization expense	775,000	$ 104,000	$ 2,102,000	$ 253,000
Technology
Intangibles
Intangibles, gross	14,950,000		14,950,000
Licenses
Intangibles
Intangibles, gross	1,006,000		1,006,000		$ 1,006,000
Customer relationships
Intangibles
Intangibles, gross	873,000		873,000		733,000
In process research and development
Intangibles
Intangibles, gross	550,000		550,000
Non-compete agreements
Intangibles
Intangibles, gross	320,000		320,000
Trademarks and tradenames
Intangibles
Intangibles, gross	68,000		68,000		28,000
Other
Intangibles
Intangibles, gross	$ 3,000		$ 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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- Definition

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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- Definition

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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