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Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Apr. 27, 2019 USD ($) site	Apr. 28, 2018 USD ($)	Apr. 29, 2017 USD ($)
Loss Contingencies [Line Items]
Site contingency, number of sites subject to environmental investigation or remediation | site	2
Accrual for environmental loss contingencies	$ 1.1	$ 1.1
Environmental remediation expense	0.1	0.3	$ 1.2
Operating leases, rental expense	7.6	5.9
Capital lease assets	$ 1.0	1.4
Capital lease liability, weighted average interest rate	1.50%
Other accrued expenses
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 0.8	$ 0.8

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- Definition

Capital Lease Assets, Net

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Capital Lease Liability, Weighted Average Interest Rate

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Site Contingency, Number of Sites Subject to Environmental Investigation or Remediation

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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