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Fair Value Measurement -Narrative (Details) - USD ($)	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impairment of intangible assets	$ 0	$ 830,000	$ 0
Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets (Liability), net	63,082,000	63,448,000
Estimate of Fair Value Measurement | Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets (Liability), net	(1,000,000)	$ (1,891,000)
Sensitivity analysis of fair value, fair value, net asset (liability), impact of change in assumption	$ 0

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- Definition

Sensitivity Analysis of Fair Value, Fair Value, Net Asset (Liability), Impact of Change in Assumption

+ References

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- Definition

Fair value of asset after deduction of liability.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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