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Intangible Assets and Goodwill (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Amortization expense	$ 2,723,000	$ 1,807,000	$ 6,862,000	$ 5,495,000
TripIt, Inc. [Member]
Earn out amount applied to goodwill	$ 1,300,000		$ 3,000,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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