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Goodwill and Purchased and Other Intangibles (Tables)
 9 Months Ended
Aug. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Purchased and other intangible assets
Purchased and other intangible assets subject to amortization as of August 31, 2018 and December 1, 2017 were as follows (in thousands): 
 
2018
 
2017
 
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Purchased technology
$
307,101

 
$
(100,832
)
 
$
206,269

 
$
223,252

 
$
(110,433
)
 
$
112,819

Customer contracts and relationships
$
753,870

 
$
(387,091
)
 
$
366,779

 
$
577,484

 
$
(356,613
)
 
$
220,871

Trademarks
56,355

 
(20,016
)
 
36,339

 
76,255

 
(56,094
)
 
20,161

Acquired rights to use technology
58,966

 
(47,097
)
 
11,869

 
71,130

 
(54,223
)
 
16,907

Other intangibles
81,357

 
(33,137
)
 
48,220

 
39,296

 
(24,396
)
 
14,900

Total other intangible assets
$
950,548

 
$
(487,341
)
 
$
463,207

 
$
764,165

 
$
(491,326
)
 
$
272,839

Purchased and other intangible assets, net
$
1,257,649

 
$
(588,173
)
 
$
669,476

 
$
987,417

 
$
(601,759
)
 
$
385,658
Amortization expense in future periods
As of August 31, 2018, we expect amortization expense in future periods to be as follows (in thousands):
Fiscal Year
 
Purchased
Technology
 
Other Intangible
Assets
Remainder of 2018
$
13,596

 
$
36,274

2019
51,112

 
118,652

2020
48,820

 
86,498

2021
26,369

 
54,119

2022
18,610

 
39,749

Thereafter
47,762

 
127,915

Total expected amortization expense
$
206,269

 
$
463,207