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Business Combinations (Narrative) (Details)
business in Thousands
1 Months Ended 12 Months Ended
Oct. 05, 2020
USD ($)
Apr. 30, 2019
USD ($)
business
Oct. 31, 2020
USD ($)
Nov. 30, 2020
USD ($)
Nov. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
May 31, 2020
USD ($)
Business Acquisition [Line Items]              
Goodwill       $ 491,726,000 $ 432,824,000 $ 314,992,000  
Acquisition-related expenses       $ 3,637,000 1,658,000 258,000 [1]  
Federal statutory income tax rate, percent       24.50%      
Share-based payment arrangement, expense       $ 23,482,000 23,311,000 $ 20,569,000  
Intangible assets       $ 111,300,000      
Restricted Stock Units (RSUs)              
Business Acquisition [Line Items]              
Vesting period       3 years      
Revolving Line of Credit              
Business Acquisition [Line Items]              
Proceeds from lines of credit     $ 98,500,000        
Credit Agreement | Revolving Line of Credit              
Business Acquisition [Line Items]              
Proceeds from lines of credit $ 98,500,000            
Chef Acquisition              
Business Acquisition [Line Items]              
Payments to acquire businesses 220,000,000.0            
Escrow deposit 12,000,000.0            
Intangible assets       $ 141,300,000      
Goodwill 59,858,000     59,900,000      
Acquisition-related expenses       2,200,000      
Revenue of acquisition       3,800,000      
Chef Acquisition | Customer-related              
Business Acquisition [Line Items]              
Intangible assets 97,300,000            
Chef Acquisition | Purchased technology              
Business Acquisition [Line Items]              
Intangible assets 38,300,000            
Chef Acquisition | Trade Names              
Business Acquisition [Line Items]              
Intangible assets $ 5,700,000            
Ipswitch              
Business Acquisition [Line Items]              
Escrow deposit   $ 22,500,000          
Goodwill   117,033,000         $ 600,000
Total purchase consideration   $ 225,000,000.0          
Number of businesses acquired | business   24          
Ipswitch | Restricted Stock Units (RSUs)              
Business Acquisition [Line Items]              
Acquisition-related expenses       400,000      
Revenue of acquisition       67,500,000 $ 28,200,000    
Consideration payable in the form of restricted stock units   $ 2,000,000.0          
Vesting period   3 years          
Remaining amortization period   3 years          
Share-based payment arrangement, expense       $ 700,000      
Ipswitch | Customer-related              
Business Acquisition [Line Items]              
Intangible assets   $ 66,600,000          
Ipswitch | Purchased technology              
Business Acquisition [Line Items]              
Intangible assets   33,100,000          
Ipswitch | Trade Names              
Business Acquisition [Line Items]              
Intangible assets   9,600,000          
Ipswitch | Term Loan              
Business Acquisition [Line Items]              
Term loan   185,000,000.0          
Term loan and maximum borrowing capacity   $ 401,000,000.0          
[1] (1)The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.