Quarterly Financial Results (Unaudited) (Schedule) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Quarterly Financial Data [Abstract]
Revenues	$ 117,881	$ 113,167	$ 108,394	$ 100,384	$ 95,155	$ 89,469	$ 84,629	$ 80,235	$ 77,489	$ 74,978	$ 72,816	$ 67,653	$ 439,826	$ 349,488	$ 292,936
Operating income (loss)	2,171	3,541	6,134	4,653	923	1,795	(2,261)	8,961	9,205	10,530	10,987	10,251	16,499	9,418	40,973
Net income (loss) attributable to Concur	$ (8,206)	$ 6,906	$ (4,838)	$ (868)	$ (14,031)	$ 2,266	$ (2,629)	$ 3,651	$ 3,359	$ 3,634	$ 6,718	$ 6,433	$ (7,006)	$ (10,743)	$ 20,144
Basic, in Dollars Per Share	$ (0.15)	$ 0.13	$ (0.09)	$ (0.02)	$ (0.26)	$ 0.04	$ (0.05)	$ 0.07	$ 0.06	$ 0.07	$ 0.14	$ 0.13	$ (0.13)	$ (0.20)	$ 0.40
Diluted, in Dollars Per Share	$ (0.15)	$ 0.12	$ (0.09)	$ (0.02)	$ (0.26)	$ 0.04	$ (0.05)	$ 0.07	$ 0.06	$ 0.07	$ 0.13	$ 0.12	$ (0.13)	$ (0.20)	$ 0.38