Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Programs (Details)

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Stock Repurchase Programs (Details) (USD $)
In Millions, except Share data, unless otherwise specified
2 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Sep. 30, 2010
Stock Repurchase Programs        
Authorized stock split declared and distributed, number of shares per each share held   2    
Stock repurchase programs, authorized amount       $ 175.0
Number of common shares repurchased during period (in shares) 279,500 513,758 885,554  
Common shares repurchased, cost 11.0 17.9 22.5  
Amount remained available for future stock repurchases   $ 115.4