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Goodwill and Purchased and Other Intangibles (Tables)
 6 Months Ended
May 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Purchased and other intangible assets
Purchased and other intangible assets subject to amortization as of May 31, 2019 and November 30, 2018 were as follows (in thousands): 
 
2019
 
2018
 
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Purchased technology
$
774,307

 
$
(170,752
)
 
$
603,555

 
$
750,286

 
$
(118,812
)
 
$
631,474

Customer contracts and relationships
$
1,247,138

 
$
(397,340
)
 
$
849,798

 
$
1,329,432

 
$
(416,176
)
 
$
913,256

Trademarks
384,855

 
(50,039
)
 
334,816

 
384,855

 
(25,968
)
 
358,887

Acquired rights to use technology
59,906

 
(46,683
)
 
13,223

 
58,966

 
(48,770
)
 
10,196

Backlog
147,000

 
(46,565
)
 
100,435

 
147,300

 
(13,299
)
 
134,001

Other intangibles
23,807

 
(8,485
)
 
15,322

 
51,096

 
(29,909
)
 
21,187

Total other intangible assets
$
1,862,706

 
$
(549,112
)
 
$
1,313,594

 
$
1,971,649

 
$
(534,122
)
 
$
1,437,527

Purchased and other intangible assets, net
$
2,637,013

 
$
(719,864
)
 
$
1,917,149

 
$
2,721,935

 
$
(652,934
)
 
$
2,069,001
Amortization expense in future periods
As of May 31, 2019, we expect amortization expense in future periods to be as follows (in thousands):
Fiscal Year
 
Purchased
Technology
 
Other Intangible
Assets
Remainder of 2019
$
63,578

 
$
131,537

2020
125,931

 
237,337

2021
103,698

 
149,829

2022
86,880

 
134,436

2023
76,876

 
134,245

Thereafter
146,592

 
526,210

Total expected amortization expense
$
603,555

 
$
1,313,594