Nature of Business and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Nov. 30, 2015 USD ($)	May. 31, 2015 USD ($)	Nov. 30, 2015 USD ($) customer	Nov. 30, 2014 USD ($) customer	Nov. 30, 2013 USD ($) customer
Summary Of Significant Accounting Policies [Line Items]
Capitalized software development costs	$ 1,300		$ 1,300	$ 4,100	$ 800
Amortization			32,286	5,521	4,090
Long-lived assets impairment charge			4,962	0	111
Restructuring expenses			12,989	2,294	13,017
Income tax expense			21,155	28,346	23,006
Tax effect on accumulated unrealized losses on investment					1,400
Advertising costs			2,500	1,800	1,600
Acquisition-related expenses			4,239	5,862	3,204
Reduction of noncurrent deferred tax liabilities	7,112		$ 7,112	0
Internal Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			3 years
Amortization			$ 1,300	$ 700	$ 0
Impairment of software development costs	1,000	$ 1,500
Restructuring expenses			$ 5,000
Restricted Stock Units (RSUs) [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period			3 years	3 years
Minimum [Member] | Computer equipment and software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			3 years
Minimum [Member] | Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			5 years
Minimum [Member] | Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			5 years
Minimum [Member] | Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period			4 years
Maximum [Member] | Computer equipment and software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			7 years
Maximum [Member] | Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			39 years
Maximum [Member] | Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset			7 years
Maximum [Member] | Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation service period			5 years
Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers | customer			0	0	0
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers | customer			0	0	0
Unrealized Gains (Losses) on Investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax expense				$ 900
New Accounting Pronouncement, Early Adoption, Effect [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification from current deferred tax assets	9,400		$ 9,400	10,100
Reclassification to noncurrent deferred tax assets	9,400		9,400	9,800
Reduction of noncurrent deferred tax liabilities	1,400		1,400	$ 300
Reclassification from current deferred tax assets	1,400		1,400
Long-term Debt [Member] | Plan [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Summary Of Significant Accounting Policies [Line Items]
Unamortized debt issuance costs reclassified from other assets to long-term debt	(1,400)		(1,400)
Other Assets [Member] | Plan [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Summary Of Significant Accounting Policies [Line Items]
Unamortized debt issuance costs reclassified from other assets to long-term debt	$ 1,400		$ 1,400