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REVENUE - Impact of Changes in Accounting Policies (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]
Net Sales	$ 246.9	$ 228.0	$ 734.3	$ 659.3
Cost of Products Sold	182.6	$ 167.9	539.1	$ 481.6
Total Inventories	124.0		124.0			$ 84.1
Contract Assets	0.9		0.9		$ 0.8
Contract Liabilities	0.2		0.2		$ 0.2
Retained Earnings	526.7		526.7			$ 472.0
Adjustments \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	(0.5)		(16.5)
Cost of Products Sold	(0.5)		(16.5)
Total Inventories	(0.6)		(0.6)
Contract Assets	0.9		0.9
Contract Liabilities	0.2		0.2
Retained Earnings	0.1		0.1
Balance Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	247.4		750.8
Cost of Products Sold	183.1		555.6
Total Inventories	124.6		124.6
Contract Assets	0.0		0.0
Contract Liabilities	0.0		0.0
Retained Earnings	$ 526.6		$ 526.6