Goodwill (Schedule) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended						0 Months Ended	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2012 Etap On Line Member		Jul. 03, 2011 GlobalExpense	Sep. 30, 2012 GlobalExpense		Sep. 30, 2011 GlobalExpense	Sep. 30, 2013 2013 acquisitions
Goodwill [Roll Forward]
Goodwill, period start	$ 281,892		$ 279,192
Addition					2,697	[1]	13,135				40,715
Goodwill, purchase accounting adjustments								1,135	[2]
Goodwill, translation adjustments	1,847	[3]	(1,132)	[3]
Goodwill, period end	324,454		281,892
Business acquisition, cost of acquired entity										$ 21,810
Business acquisition earn out performance period					3 years

[1] On August 1, 2009, we completed the acquisition of Etap-On-Line. The purchase price was subject to specified earn-out provisions determined over a three-year period ended September 30, 2012. We considered the earn-out amounts as additional contingent consideration and recorded them in goodwill as incurred. We recorded a $2.7 million earn-out as additional goodwill for 2012.

[2] In the fourth quarter of 2011, we completed the acquisition of GlobalExpense for total consideration of $21.8 million. We finalized our purchase price allocation in 2012. Goodwill increased by $1.1 million as a result of the finalization of purchase price allocation.

[3] Other adjustments primarily represent the impact of foreign currency translation for instances when goodwill is recorded in foreign entities whose functional currency is also their local currency. These goodwill balances are translated into U.S. Dollars using exchange rates in effect at period end. Adjustments are included in other comprehensive income (loss).