Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013	Nov. 30, 2013	May 13, 2014 Modulus [Member]	May 31, 2014 Modulus [Member]	May 31, 2014 Modulus [Member]	May 24, 2013 Rollbase [Member]	May 31, 2014 Rollbase [Member]	May 31, 2014 Rollbase [Member]
Business Acquisition [Line Items]
Equity interests acquired						100.00%			100.00%
Total purchase consideration						$ 15,000,000			$ 9,900,000
Purchase consideration, cash						12,500,000			9,500,000
Purchase consideration, contingent consideration						2,500,000			400,000
Fair value of contingent liabilities						1,500,000
Goodwill	230,681,000		230,681,000		224,286,000	6,433,000			4,798,000
Goodwill, useful life for tax purposes						15 years
Acquisition-related costs	1,630,000	1,272,000	2,576,000	1,272,000			200,000	200,000
Expected payout period									2 years
Earn-out provision									5,300,000
Expense recognized related to contingent earn-out provisions										$ 1,200,000	$ 2,100,000