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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended1 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Mar. 31, 2010
Transaction Systems Limited (TranSys)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Transaction gains on advances to foreign subsidiaries$ 0.1$ 0.8$ 1.8 
Maximum maturity period of highly liquid investment considered to be cash equivalents (in months)3   
Gain from change in exchange rates of U.S. dollar denominated investments of a wholly-owned subsidiary in the U.K$ 3.2   
Investment in variable interest entity    
Percentage of common stock owned by the entity (as a percent)   50.00%