Other Accrued Expenses - Schedule of accrued expenses (Details) - USD ($) $ in Millions	Aug. 31, 2020	May 31, 2020	Aug. 31, 2019
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 41.4	$ 38.8	$ 43.6
Accrued bonus and commissions	11.8	12.1	9.3
Returns liability	43.1	43.5	35.5
Accrued other taxes	21.4	22.9	19.4
Accrued advertising and promotions	10.8	9.9	10.2
Other accrued expenses	38.1	34.3	37.6
Total accrued expenses	$ 166.6	$ 161.5	$ 155.6