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Acquisition (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Sep. 12, 2018	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired			$ 0.0	$ 421.6
Grakon
Business Acquisition [Line Items]
Percentage acquired	100.00%
Payments to acquire businesses, net of cash acquired	$ 422.1
Goodwill, increase (decrease)			(0.2)
Acquisition-related costs incurred			$ 10.9	11.5
Grakon | Selling and administrative expenses
Business Acquisition [Line Items]
Acquisition-related costs incurred		$ 8.3		8.9
Grakon | Cost of Sales [Member]
Business Acquisition [Line Items]
Acquisition-related costs incurred		$ 2.6		$ 2.6

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

+ References

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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