Equity Incentive Plan (Restricted Stock Activity) (Details) (USD $) In Thousands, except Share data	12 Months Ended
	Sep. 30, 2011
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Beginning Balance of outstanding restricted stock	329,000
Shares, Granted	75,000	[1]
Shares, Vested	(314,000)
Shares, Ending Balance of outstanding restricted stock	90,000
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock	$ 18.09
Weighted Average Grant Date Fair Value, Granted	$ 22.46	[1]
Weighted Average Grant Date Fair Value, Vested	$ 18.22
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$ 21.30
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock	$ 1,387
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Beginning Balance of outstanding restricted stock	6,053,000
Shares, Granted	2,624,000
Shares, Vested	(2,871,000)
Shares, Forfeited or not earned	(316,000)
Shares, Ending Balance of outstanding restricted stock	5,490,000
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock	$ 14.25
Weighted Average Grant Date Fair Value, Granted	$ 21.90
Weighted Average Grant Date Fair Value, Vested	$ 14.47
Weighted Average Grant Date Fair Value, Forfeited or not earned	$ 14.88
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$ 17.75
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock	$ 14,591

[1] These shares were issued to our non-employee directors as part of their compensation. The restrictions on these shares generally lapse in one or two equal annual installments from the date of grant.