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REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018	Apr. 29, 2018	Apr. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Pre-production Costs	$ 32.5		$ 32.5			$ 20.5
Cost of Products Sold	182.6	$ 167.9	$ 539.1	$ 481.6
Payment terms, min			30 days
Payment terms, max			45 days
Contract asset	0.9		$ 0.9		$ 0.8
Contract asset, reclassified to receivable			(0.8)
Contract asset, impairment			0.0
Contract liabilities	0.2		0.2		0.2
Contract liabilities, revenue recognized			0.0
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase to retained earnings					0.1
Difference between revenue guidance in effect before and after topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of Products Sold	(0.5)		(16.5)
Contract asset	0.9		0.9
Contract liabilities	0.2		0.2
Tooling reimbursements | Difference between revenue guidance in effect before and after topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of Products Sold	$ 0.5		$ 16.6
Retained Earnings | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase to retained earnings					$ 0.1

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