Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Jun. 01, 2018	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2020	May 31, 2019	May 31, 2018	Jun. 01, 2019
New accounting pronouncements adopted
Revenue, practical expedient application of ASC 606	true
Assets of discontinued operations						$ 29.2					$ 29.2		$ 55.8
Other current assets		$ 77.2				36.2				$ 77.2	36.2		35.7
Intangible assets, net		6.0				22.2				6.0	22.2		13.7
Operating lease ROU assets		89.7								89.7			96.6
Other non-current assets		81.5				77.5				81.5	77.5		75.7
Accrued liabilities		161.6				140.5				161.6	140.5		150.5
Liabilities of discontinued operations		29.9				29.2				29.9	29.2		54.5
Operating lease liabilities		70.9								70.9			77.7
Other liabilities		34.4				28.3				34.4	28.3		25.2
Retained earnings		706.0				709.8				706.0	709.8		712.3
Unamortized deferred gains													2.5
Inventories		623.1				523.7				623.1	523.7
Contract assets - current		49.3				59.2				49.3	59.2
Sales		416.5	$ 553.1	$ 560.9	$ 541.5	562.7	$ 529.5	$ 493.3	$ 466.3	2,072.0	2,051.8	$ 1,748.3
Operating income (loss)		(14.9)	5.3	28.1	22.8	29.3	29.8	16.8	22.4	41.3	98.3	86.0
Provision for income taxes										5.6	4.9	3.5
Income (Loss) from continuing operations		(15.0)	2.6	20.1	17.1	26.6	27.4	11.2	18.9	24.8	84.1	73.7
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net income										4.4	7.5	15.6
Income (Loss) from continuing operations		$ (15.0)	$ 2.6	$ 20.1	$ 17.1	$ 26.6	$ 27.4	$ 11.2	$ 18.9	24.8	84.1	73.7
Accounts receivable										14.8	(34.4)	35.4
Contract assets										9.9	(9.7)
Inventories										(94.5)	(80.9)	(25.8)
Other										$ (35.9)	$ (23.1)	$ (21.7)
ASC 606 | ASC 606 Adjustments
New accounting pronouncements adopted
Retained earnings	$ (20.4)
ASC 842
New accounting pronouncements adopted
Assets of discontinued operations													26.6
Other current assets													(0.5)
Intangible assets, net													(8.5)
Operating lease ROU assets													96.6
Other non-current assets													(1.8)
Accrued liabilities													10.0
Liabilities of discontinued operations													25.3
Operating lease liabilities													77.7
Other liabilities													(3.1)
Retained earnings													2.5
ASC 842 | Right of use including discontinued operations
New accounting pronouncements adopted
Operating lease ROU assets													123.2
Operating lease liabilities													116.8
ASC 842 | Held for sale or Disposed
New accounting pronouncements adopted
Operating lease ROU assets													26.6
Operating lease liabilities													$ 25.3