Ciena Corporation and Significant Accounting Policies and Estimates - Opening Balance Adjustments (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Nov. 03, 2019	Nov. 02, 2019
ASSETS
Operating right-of-use assets	$ 57,026	$ 53,334
Total assets	4,180,917	3,946,680	$ 3,893,346
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Accrued liabilities and other short-term obligations	334,132	381,256	382,740
Operating lease liabilities	19,035	20,498
Other long-term obligations	123,185	127,503	148,747
Long-term operating lease liabilities	61,415	55,564
Total liabilities and stockholders’ equity	4,180,917	3,946,680	3,893,346
Straight-line rent			$ 5,434
Short-term restructuring reserve liability	2,915
Long-term restructuring reserve liability	$ 0
Accounting Standards Update 2016-02
ASSETS
Operating right-of-use assets		53,334
Total assets		53,334
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Accrued liabilities and other short-term obligations		(1,484)
Operating lease liabilities		20,498
Other long-term obligations		(21,244)
Long-term operating lease liabilities		55,564
Total liabilities and stockholders’ equity		53,334
Operating right-of-use assets before adjustments		76,000
Straight-line rent		(5,400)
Tenant improvement allowances		(6,200)
Short-term restructuring reserve liability		(1,500)
Long-term restructuring reserve liability		$ (9,600)