This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investments (Details) (USD $)					9 Months Ended
Investments (Details) (USD $)	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011 ClearTrip [Member]	Mar. 31, 2011 ClearTrip [Member]	Sep. 30, 2010 RideCharge [Member]	Sep. 30, 2009 RideCharge [Member]
Investments	$ 49,099,000	$ 6,045,000				$ 40,000,000	$ 6,000,000	$ 6,000,000
Warrant to purchase preferred stock, maximum					1,500,000
Warrant term (years)					5
Cost method investments	36,100,000		6,000,000
Equity method investment	$ 13,000,000			$ 0