Inventories (Tables)
 12 Months Ended
Oct. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
As of the dates indicated, inventories are comprised of the following (in thousands):

 
October 31,
 
2014
 
2015
Raw materials
$
64,853

 
$
53,082

Work-in-process
8,371

 
9,120

Finished goods
165,799

 
125,966

Deferred cost of goods sold
75,763

 
55,995

 
314,786

 
244,163

Provision for excess and obsolescence
(60,126
)
 
(53,001
)
 
$
254,660

 
$
191,162
Activity in reserve for excess and obsolete inventory
The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands):
 
 
 
 
 
 
 
 
 
Year ended
 
Beginning
 
 
 
 
 
Ending
October 31,
 
Balance
 
Provisions
 
Disposals
 
Balance
2013
 
$
40,010

 
$
19,938

 
$
18,385

 
$
41,563

2014
 
$
41,563

 
$
32,332

 
$
13,769

 
$
60,126

2015
 
$
60,126

 
$
26,846

 
$
33,971

 
$
53,001