Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Allowance for uncollectible accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 0.7	$ 0.9	$ 0.5
(Benefits)/ charges to income	0.0	(0.2)	0.2
Deductions	0.0	0.0	0.0
Other	0.0	0.0	0.2
Balance at end of period	0.7	0.7	0.9
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	7.5	6.6	3.0
(Benefits)/ charges to income	1.8	0.9	0.0
Deductions	0.0	0.0	(1.2)
Other	0.0	0.0	4.8
Balance at end of period	$ 9.3	$ 7.5	$ 6.6