Other Accrued Expenses (Details) - Schedule of accrued expenses (USD $) In Millions, unless otherwise specified	Aug. 31, 2013	May 31, 2013	Aug. 31, 2012
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 40.3	$ 45.8	$ 44.1
Accrued bonus and commissions	20.7	22.0	25.6
Accrued other taxes	24.4	29.3	37.2
Accrued advertising and promotions	33.1	38.2	34.1
Accrued income taxes	4.4	5.5	6.8
Accrued insurance	8.9	8.7	8.6
Other accrued expenses	28.2	30.0	31.7
Total accrued expenses	$ 160.0	$ 179.5	$ 188.1