Other Accrued Expenses (Details) - Schedule of accrued expenses (USD $) In Millions, unless otherwise specified	Aug. 31, 2014	May 31, 2014	Aug. 31, 2013
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 40.4	$ 41.7	$ 40.3
Accrued bonus and commissions	23.3	36.9	20.7
Accrued other taxes	23.2	27.5	24.4
Accrued advertising and promotions	29.8	35.6	33.1
Accrued income taxes	3.5	4.7	4.4
Accrued insurance	8.6	8.3	8.9
Other accrued expenses	29.2	30.0	28.2
Total accrued expenses	$ 158.0	$ 184.7	$ 160.0