Nature of Business and Summary of Significant Accounting Policies (Narrative) (Details) enterprise_customer in Millions, developer in Millions	3 Months Ended				12 Months Ended
	Nov. 30, 2017 USD ($)	May 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	Nov. 30, 2017 USD ($) enterprise_customer developer software_vendor	Nov. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)	Feb. 28, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of independent software vendors, more than | software_vendor					1,700
Number of enterprise customers, more than | enterprise_customer					0.1
Number of developers, more than | developer					2
Capitalized software development costs	$ 0		$ 0		$ 0	$ 0	$ 1,300,000
Amortization					35,370,000	30,815,000	32,286,000
Impairment of goodwill and intangible assets					0	92,000,000	0
Impairment of goodwill and long-lived assets					762,000		4,962,000
Advertising costs					1,500,000	2,900,000	2,500,000
Acquisition-related expenses					1,458,000	1,240,000	4,239,000
Restructuring related costs					$ 22,210,000	1,692,000	12,989,000
Internal Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of major asset					3 years
Amortization					$ 600,000	$ 1,000,000	1,300,000
Impairment of software development costs		$ 1,500,000	$ 1,000,000
Impairment of goodwill and long-lived assets							$ 5,000,000
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
Long-term Debt [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								$ 1,000,000
Other Assets [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								$ (1,000,000)
Modulus [Member] | Purchased Technology [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of software development costs				$ 5,100,000		$ 5,100,000
Application Development and Deployment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of goodwill and intangible assets	$ 92,000,000					$ 92,000,000