Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Detail)

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Shareholders' Equity (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2012
May 01, 2012
Sep. 27, 2011
Jun. 30, 2012
Future Description [Member]
Equity [Line Items]          
Shares authorized under share repurchase program       10  
Stock repurchased and retired during period, shares 2.8        
Stock repurchased and retired during period, value $ 104,400,000        
Stock repurchased and retired during period, average price $ 37.80        
Shares remaining authorized for repurchase 5.3 5.3      
Cash dividend per common share     $ 0.125    
Dividend payment date   Jun. 20, 2012     Sep. 19, 2012
Record date   Jun. 06, 2012     Sep. 05, 2012