Quarterly Financial Results (Unaudited) (Schedule) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	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, 2013	Sep. 30, 2012	Sep. 30, 2011
Quarterly Financial Data [Abstract]
Revenues	$ 156,922	$ 138,710	$ 127,370	$ 122,798	$ 117,881	$ 113,167	$ 108,394	$ 100,384	$ 95,155	$ 89,469	$ 84,629	$ 80,235	$ 545,800	$ 439,826	$ 349,488
Operating income (loss)	3,521	13,800	(2,653)	(8,272)	2,171	3,541	6,134	4,653	923	1,795	(2,261)	8,961	6,396	16,499	9,418
Net income (loss) attributable to Concur	$ (7,532)	$ 2,815	$ (7,645)	$ (12,032)	$ (8,206)	$ 6,906	$ (4,838)	$ (868)	$ (14,031)	$ 2,266	$ (2,629)	$ 3,651	$ (24,394)	$ (7,006)	$ (10,743)
Basic, in Dollars Per Share	$ (0.13)	$ 0.05	$ (0.14)	$ (0.22)	$ (0.15)	$ 0.13	$ (0.09)	$ (0.02)	$ (0.26)	$ 0.04	$ (0.05)	$ 0.07	$ (0.44)	$ (0.13)	$ (0.20)
Diluted, in Dollars Per Share	$ (0.13)	$ 0.05	$ (0.14)	$ (0.22)	$ (0.15)	$ 0.12	$ (0.09)	$ (0.02)	$ (0.26)	$ 0.04	$ (0.05)	$ 0.07	$ (0.44)	$ (0.13)	$ (0.20)