Employee Benefit Plans (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 Year State Segment OperatingDivisions Market	Sep. 30, 2010	Sep. 30, 2009
Employee Benefit Plans (Textuals) [Abstract]
Range of percentage of units vested upon achieving performance criteria	0% to 200% of the number of units
Conditional period for employees for availing deferred compensation	six months or more
Discounted price for purchasing company's common stock	no more than 85% of the fair market value of the stock
Annual limit on common stock purchases under the ESPP	lesser of 15% of the employee’s annual compensation or $25,000
Number of shares issued under employee benefit plans	91,350	107,952	155,254
Value of shares issued under employee benefit plans	$ 0.9	$ 1.1	$ 1.2
Stock options minimum vesting period	P3Y
Stock options maximum vesting period	P9.75Y
Stock options expiration period	10 years after the grant date
Number of shares granted to purchase	6,172,500		6,115,000
Shares available for grant	12,100,000
Total intrinsic value of stock exercised	0.9	7.6	4.6
Aggregate intrinsic value of options outstanding	0.1
Aggregate intrinsic value of options exercisable	0
Lower range of stock options outstanding exercise price	$ 9.03
Upper range of stock options outstanding exercise price	$ 36.92
Weighted average remaining contractual lives of options outstanding	6.5
Weighted average remaining contractual lives of options exercisable	4.0
Weighted average fair value per share of options granted	$ 3.98		$ 3.89
Unrecognized compensation expense related to stock options	57.2
Weighted average period over which unrecognized compensation cost is expected to be recognized	5.0
Accrued incentive bonus	0.5
Period for the performance units granted	33 months
Liability related to performance unit grants	5.0
2008 Performance unit Plan [Member]
Employee Benefit Plans (Textuals) [Abstract]
Performance units granted	437,500
Amount earned and paid under performance unit grant	4.9
2009 Performance unit Plan [Member]
Employee Benefit Plans (Textuals) [Abstract]
Performance units granted	551,250
Amount earned and paid under performance unit grant	5.0
Deferred Compensation Plan [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	3.9	4.8	3.9
Deferred compensation liability	23.3	24.6
Supplemental executive retirement plan [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	2.9	2.7	2.2
Deferred compensation liability	17.3	15.2
Deferred compensation plan for select group of employees [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	(0.7)	2.1	(1.1)
Employee stock option [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	14.2	13.3	13.7
Performance restricted stock units [Member]
Employee Benefit Plans (Textuals) [Abstract]
Performance RSU's granted		200,000
RSU vesting period	2 years
Contingent Right for Performance Restricted Stock Units	To receive one share of the Company’s common stock if the vesting conditions are satisfied
Fair Value of the Performance RSU's	$ 11.53
Performance unit plan [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	0.9
Performance Based Unit [Member]
Employee Benefit Plans (Textuals) [Abstract]
RSU vesting period	3 years
Range of percentage of units vested upon achieving performance criteria, low	0.00%
Range of percentage of units vested upon achieving performance criteria, high	200.00%
September 2010 Performance Unit Award [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	1.2
November 2010 Performance Unit Award [Member]
Employee Benefit Plans (Textuals) [Abstract]
Share based compensation expenses and Net expenses related to deferred compensation plan and Supplemental executive retirement plan and Stock option	1.0
Performance RSU's granted		300,000
Fair Value of the Performance RSU's	$ 12.69
Range of percentage of units vested upon achieving performance criteria	0% to 200% of the number of units
Liability on restricted stock units	$ 1.0