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Intangible Assets
 12 Months Ended
Oct. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
As of the dates indicated, intangible assets are comprised of the following (in thousands):

 
October 31,
 
2014
 
2015
 
Gross
Intangible
 
Accumulated
Amortization
 
Net
Intangible
 
Gross
Intangible
 
Accumulated
Amortization
 
Net
Intangible
Developed technology
$
417,833

 
$
(351,929
)
 
$
65,904

 
$
506,647

 
$
(382,130
)
 
$
124,517

Patents and licenses
46,538

 
(45,908
)
 
630

 
46,538

 
(46,072
)
 
466

Customer relationships, covenants not to compete, outstanding purchase orders and contracts
323,573

 
(261,430
)
 
62,143

 
388,621

 
(310,931
)
 
77,690

Total intangible assets
$
787,944

 
$
(659,267
)
 
$
128,677

 
$
941,806

 
$
(739,133
)
 
$
202,673



The aggregate amortization expense of intangible assets was $71.3 million, $57.2 million and $79.9 million for fiscal 2013, fiscal 2014 and fiscal 2015, respectively. Expected future amortization of intangible assets for the fiscal years indicated is as follows (in thousands):

Year Ended October 31,
 
2016
$
75,627

2017
41,773

2018
19,092

2019
18,545

2020
17,518

Thereafter
30,118

 
$
202,673