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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Nov. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Revenue reserve rollforward
Revenue Reserve
Revenue reserve rollforward (in thousands):
 
 
2018
 
2017
 
2016
Beginning balance
 
$
22,006

 
$
23,096

 
$
19,446

Amount charged to revenue
 
65,241

 
61,031

 
55,739

Actual returns
 
(61,822
)
 
(62,121
)
 
(52,089
)
Ending balance
 
$
25,425

 
$
22,006

 
$
23,096
Allowance for doubtful accounts
(in thousands)
 
2018
 
2017
 
2016
Beginning balance
 
$
9,151

 
$
6,214

 
$
7,293

Increase due to acquisition
 
5,602

 
2,391

 
77

Charged to operating expenses
 
5,962

 
4,411

 
1,337

Deductions(1)
 
(5,734
)
 
(3,865
)
 
(2,493
)
Ending balance
 
$
14,981

 
$
9,151

 
$
6,214

________________________________________ 
(1)  
Deductions related to the allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.
Finited-lived intangible assets schedule of weighted average useful lives
 
Weighted Average
Useful Life (years)
Purchased technology
6
Customer contracts and relationships
9
Trademarks
9
Acquired rights to use technology
10
Backlog
2
Other intangibles
4