FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended																		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 10-Year Treasury Yield Curve Rate [Member]	Jun. 30, 2014 10-Year Credit Default Swap Rate [Member]	Jun. 30, 2014 1-Year Credit Default Swap Rate [Member]	Jun. 30, 2014 1-Year Treasury Yield Curve Rate [Member]	Jun. 30, 2014 2-Year Treasury Yield Curve Rate [Member]	Jun. 30, 2014 2-Year Credit Default Swap Rate [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Low [Member]	Jun. 30, 2014 Medium [Member]	Jun. 30, 2014 High - Lower Range [Member]	Jun. 30, 2014 High - Upper Range [Member]	Jun. 30, 2014 Average	Jun. 30, 2014 Other Current Liabilities [Member]	Sep. 30, 2013 Other Current Liabilities [Member]	Sep. 30, 2013 Other Noncurrent Liabilities [Member]	Jun. 30, 2014 IGT_Strategy9 [Member]	Jun. 30, 2014 IGT_Strategy9 [Member] Minimum [Member]	Jun. 30, 2014 IGT_Strategy9 [Member] Maximum [Member]	Jun. 30, 2014 Double Down Interactive LLC [Member]	Jun. 30, 2014 Double Down Interactive LLC [Member] Minimum [Member]	Jun. 30, 2014 Double Down Interactive LLC [Member] Maximum [Member]
Internal Earnings Projection Probability																				10.00%	50.00%		9.00%	64.00%
Fair Value Inputs, Discount Rate																			10.00%			18.00%
Business Combination, Contingent Consideration, Liability (in Dollars)																$ 55.2	$ 57.6	$ 48.8	$ 0.6
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (in Dollars)	$ 8.8	$ 28.0
Fair Value Inputs, Entity Credit Risk											7.50%	8.00%	9.50%	11.00%
Jackpot Liabilities Expected Payment Term									1 year	25 years					10 years
Fair Value Assumptions, Risk Free Interest Rate (in hundredths)			2.53%	2.52%	0.32%	0.10%	0.46%	0.54%