Business Combinations Business Combinations (Acquisition of Defense.Net, Inc.) (Details) (USD $)				0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	May 22, 2014 Defense.net [Member]	May 22, 2014 Developed Technology Rights [Member] Defense.net [Member]	May 22, 2014 Customer Relationships [Member] Defense.net [Member]
Business Acquisition [Line Items]
Consideration transferred				$ 49,700,000
Transaction costs				300,000
Cash				220,000
Current assets				249,000
Property and equipment, net				2,353,000
Deferred tax assets, net				1,162,000
Developed technology, customer relationships and other intangibles				6,682,000
Goodwill	556,957,000	523,727,000	348,239,000	39,346,000
Total assets acquired				50,012,000
Accrued liabilities				(256,000)
Deferred revenue				(97,000)
Total liabilities assumed				(353,000)
Net assets acquired				49,659,000
Finite-lived intangible assets acquired					$ 3,600,000	$ 3,100,000
Discount rate				15.00%
Weighted average useful life				6 years 219 days