Intangible Assets and Goodwill (Schedule of Goodwill) (Details) (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011
Goodwill Balance as of September 30, 2010	$ 194,989
Other adjustments	1,557	[1]
Balance as of June 30, 2011	269,177
TripIt, Inc. [Member]
Addition - TripIt	69,672
Additions - Other [Member]
Addition - Etap	$ 2,959	[2]

[1] Other adjustments 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).

[2] On August 1, 2009, we completed the acquisition of Etap-On-Line ("Etap Acquisition"). The purchase price is subject to specified earn out provisions to be determined over a three year period ending August 1, 2012. We recorded $1.3 million and $3.0 million earn-out amounts as additional goodwill for the three and nine months ended June 30, 2011. We consider the earn-out amounts as additional contingent consideration and will record them in goodwill as incurred.