Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	May 31, 2014	Aug. 31, 2013
Current Assets:
Allowance for doubtful accounts	$ 2.1	$ 1.5
Stockholders’ Equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	52,565,317	52,205,933
Common stock, shares outstanding	42,846,062	42,486,678
Treasury Stock, shares	9,719,255	9,719,255