Business Combinations (Acquisition of Versafe Ltd) (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 17, 2013 Versafe [Member]	Sep. 30, 2013 Developed Technology [Member]	Sep. 17, 2013 Developed Technology [Member] Versafe [Member]	Sep. 17, 2013 Customer Relationships [Member] Versafe [Member]	Sep. 17, 2013 General and Administrative Expenses [Member] Versafe [Member]
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 212,642,000	$ 128,335,000	$ 0	$ 91,700,000
Business acquisition, transaction costs								400,000
Assets acquired
Cash				4,020,000
Current assets				1,309,000
Property and equipment, net				41,000
Developed technology, customer relationships and other intangibles				21,260,000		15,400,000	5,900,000
Goodwill	523,727,000	348,239,000	234,691,000	75,937,000
Total assets acquired				102,567,000
Liabilities assumed
Accrued liabilities				(4,877,000)
Deferred revenue				(611,000)
Deferred tax liabilities, net				(5,335,000)
Total liabilities assumed				10,823,000
Net assets acquired				$ 91,744,000
Discount rate				25.00%
Acquired and developed technology and customer relationship assets estimated useful lives					5 years	5 years
Weighted average useful life				5 years 6 months