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Stock-based Compensation Plans (Schedule of Share-based Compensation, Restricted Stock Units Activity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Y
Sep. 30, 2011
Y
Sep. 30, 2010
Y
Sep. 30, 2009
Y
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Expected to vest in subsequent periods, Weighted average remaining contractual term 1.26      
RSUs under 2006 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Outstanding, shares 2,065,766 2,095,713 1,714,491  
Granted, shares 1,406,318 990,139 986,583  
Vested, shares (867,451) (762,893) (513,505)  
Canceled, shares (180,871) (257,193) (91,856)  
Outstanding, shares 2,423,762 2,065,766 2,095,713 1,714,491
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Outstanding, Weighted average grant date fair value per share $ 6.11 $ 7.66 $ 9.73  
Granted, Weighted average grant date fair value per share $ 2.19 $ 3.63 $ 4.91  
Vested, Weighted average grant date fair value per share $ 5.44 $ 7.02 $ 9.20  
Canceled, Weighted average grant date fair value per share $ 5.33 $ 6.48 $ 8.00  
Outstanding, Weighted average grant date fair value per share $ 4.13 $ 6.11 $ 7.66 $ 9.73
Outstanding, Weighted average remaining contractual term 1.0 1.6 1.9 2.3
Outstanding, Aggregate intrinsic value $ 5.1 $ 6.3 $ 9.4  
Vested, Aggregate intrinsic value 2.2 2.7 2.5  
Outstanding, Weighted average remaining contractual term 1.0 1.6 1.9 2.3
Outstanding, Aggregate intrinsic value 11.9 5.1 6.3 9.4
Expected to vest in subsequent periods, shares 2,327,374      
Expected to vest in subsequent periods, Weighted average grant date fair value per share $ 4.15      
Expected to vest in subsequent periods, Weighted average remaining contractual term 1.0      
Expected to vest in subsequent periods, Aggregate intrinsic value $ 11.4