Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2012 Y	Sep. 30, 2011	Sep. 30, 2010
Operations [Line Items]
Voting interest in Concur Japan	75.00%
Noncontrolling interest	$ 581,000	$ 1,176,000
Impairment of property and equipment	0	0	0
Impairment for investment	0	0	0
Intangible asset minimum useful life	2
Intangible asset maximum useful life	12
Impairment of intangible assets	0	0	0
Impairment of goodwill	0	0	0
RSUs requisite service period	4 years
Advertising expense	9,999,000	9,143,000	8,521,000
Rent expense	$ 4,443,000	$ 3,273,000	$ 2,962,000
Number of customers that accounted for more than ten percent of total revenue	0	0	0
Number of customers that accounted for more than ten percent of accounts receivable	0	0
Accounts Receivable
Operations [Line Items]
Concentration risk percentage	10.00%	10.00%
Revenues
Operations [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%