Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Fair Value Inputs, Discount Rate (in hundredths)	18.00%
Business Acquisition, Contingent Consideration, at Fair Value, Current	$ 57.6	$ 42.8
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent	48.8	73.6
Earn-out consideration paid	45.0
Increase in earn-out payable fair value	35.0	27.5	0
Accrued retention plan compensation [Member]
Increase in earn-out payable fair value	$ 37.9
Minimum [Member]
Internal Earnings Projection Probability (in hundredths)	5.00%
Jackpot Liabilities Expected Payment Term	1 year
Maximum [Member]
Internal Earnings Projection Probability (in hundredths)	75.00%
Jackpot Liabilities Expected Payment Term	25 years
Low [Member]
Fair Value Inputs, Entity Credit Risk (in hundredths)	7.50%
Medium [Member]
Fair Value Inputs, Entity Credit Risk (in hundredths)	8.00%
High - Lower Range [Member]
Fair Value Inputs, Entity Credit Risk (in hundredths)	9.50%
High - Upper Range [Member]
Fair Value Inputs, Entity Credit Risk (in hundredths)	11.25%
Weighted Average [Member]
Jackpot Liabilities Expected Payment Term	10 years
10-Year Treasury Yield Curve Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	2.60%
10-Year Credit Default Swap Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	1.76%
1-Year Credit Default Swap Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	0.17%
1-Year Treasury Yield Curve Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	0.08%
2-Year Treasury Yield Curve Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	0.32%
2-Year Credit Default Swap Rate [Member]
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)	0.35%