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Acquisitions (Details) - USD ($) $ in Millions			3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 03, 2017	Jul. 27, 2017	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Jan. 27, 2018	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Business Acquisition [Line Items]
Revenues												$ 908.3	$ 816.5	$ 809.1
Payments to Acquire Businesses, Net of Cash Acquired												130.9	0.0	0.0
Net Income			$ 36.8	$ (24.3)	$ 24.2	$ 20.5	$ 23.1	$ 23.7	$ 24.9	$ 21.2		57.2	$ 92.9	$ 84.6
Procoplast [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												1.3
Business Acquisition, Pro Forma Adjustment to Other Income				(0.2)							$ (0.5)
Percentage voting interests acquired		100.00%
Payments to Acquire Businesses, Net of Cash Acquired		$ 22.2
Goodwill, Purchase Accounting Adjustments			(1.3)
Business Acquisition, Pro Forma Adjustment to Income Tax Expense				$ (0.1)							$ (0.2)
Procoplast [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												1.1
Procoplast [Member] | Cost of Sales [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												0.2
Pacific Insight [Member]
Business Acquisition [Line Items]
Revenues												54.4
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												5.5
Percentage voting interests acquired	100.00%
Payments to Acquire Businesses, Net of Cash Acquired	$ 108.7
Goodwill, Purchase Accounting Adjustments			$ 1.9
Net Income												1.5
Pacific Insight [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												4.9
Pacific Insight [Member] | Cost of Sales [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed												$ 0.6

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

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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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