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Nature of Business and Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
$ / shares
Aug. 31, 2018
USD ($)
$ / shares
May 31, 2018
USD ($)
$ / shares
Feb. 28, 2018
USD ($)
$ / shares
Nov. 30, 2017
USD ($)
$ / shares
Aug. 31, 2017
USD ($)
$ / shares
May 31, 2017
USD ($)
$ / shares
Feb. 28, 2017
USD ($)
$ / shares
Aug. 31, 2016
USD ($)
Nov. 30, 2018
USD ($)
enterprise_customer
developer
software_vendor
$ / shares
Nov. 30, 2017
USD ($)
$ / shares
Nov. 30, 2016
USD ($)
$ / shares
Dec. 01, 2018
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                   100,000      
Number of developers, more than | developer                   2,000,000      
Capitalized software development costs $ 0       $ 0         $ 0 $ 0 $ 0  
Amortization                   37,561,000 35,370,000 30,815,000  
Asset impairment charges 5,100,000                 5,147,000 0 0  
Advertising costs                   1,400,000 1,500,000 2,900,000  
Acquisition-related expenses                   258,000 1,458,000 1,240,000  
Restructuring related costs                   2,251,000 22,210,000 1,692,000  
Excess tax benefits related to share based compensation                   861,000 0 0  
Other assets, noncurrent (5,243,000)       (1,992,000)         (5,243,000) (1,992,000)    
Revenue (111,333,000) $ (95,683,000) $ (96,102,000) $ (94,047,000) (116,079,000) $ (97,310,000) $ (93,213,000) $ (90,970,000)   (397,165,000) (397,572,000) (405,341,000)  
Net income $ (18,430,000) $ (16,746,000) $ (15,403,000) $ (12,912,000) $ (16,429,000) $ (11,172,000) $ (10,341,000) $ 525,000   $ (63,491,000) $ (37,417,000) $ 55,726,000  
Diluted earnings per share (in dollars per share) | $ / shares $ (0.41) $ (0.37) $ (0.33) $ (0.27) $ (0.34) $ (0.23) $ (0.21) $ 0.01   $ (1.38) $ (0.77) $ 1.13  
Internal Use Software                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   3 years      
Amortization                   $ 200,000 $ 600,000 $ 1,000,000  
Restricted Stock Units (RSUs)                          
Summary Of Significant Accounting Policies [Line Items]                          
Stock-based compensation service period                   3 years 3 years 3 years  
Minimum | Computer equipment and software                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   3 years      
Minimum | Buildings and Improvements                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   5 years      
Minimum | Furniture and fixtures                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   5 years      
Minimum | Stock Options                          
Summary Of Significant Accounting Policies [Line Items]                          
Stock-based compensation service period                   4 years      
Maximum | Computer equipment and software                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   7 years      
Maximum | Buildings and Improvements                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   39 years      
Maximum | Furniture and fixtures                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful lives of major asset                   7 years      
Maximum | Stock Options                          
Summary Of Significant Accounting Policies [Line Items]                          
Stock-based compensation service period                   5 years      
Accounting Standards Update 2016-16                          
Summary Of Significant Accounting Policies [Line Items]                          
Other assets, noncurrent                         $ 3,300,000
Modulus | Purchased technology                          
Summary Of Significant Accounting Policies [Line Items]                          
Impairment of software development costs                 $ 5,100,000     $ 5,100,000  
Application Development and Deployment                          
Summary Of Significant Accounting Policies [Line Items]                          
Impairment of goodwill and intangible assets                   $ 0 $ 0 92,000,000  
Revenue                   (79,877,000) (80,445,000) (81,065,000)  
Retained Earnings                          
Summary Of Significant Accounting Policies [Line Items]                          
Net income                   (63,491,000) (37,417,000) $ 55,726,000  
Retained Earnings | Accounting Standards Update 2016-09                          
Summary Of Significant Accounting Policies [Line Items]                          
Cumulative effect adjustment         $ 600,000           600,000    
Retained Earnings | Accounting Standards Update 2016-16                          
Summary Of Significant Accounting Policies [Line Items]                          
Cumulative effect adjustment                         $ 3,300,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                          
Summary Of Significant Accounting Policies [Line Items]                          
Revenue                   18,000,000 8,000,000    
Net income                   $ 14,000,000 $ 8,000,000    
Diluted earnings per share (in dollars per share) | $ / shares                   $ 0.30 $ 0.17