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Sale of Non-Digital Division (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of intangible assets	$ 0	$ 830	$ 0
Non-Digital Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets sold	517
Gain from sale of non-digital division	$ 1,267

X

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Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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