Quarterly report pursuant to Section 13 or 15(d)

LICENSE, SETTLEMENT AND RELEASE AGREEMENT (Details)

v3.19.1
LICENSE, SETTLEMENT AND RELEASE AGREEMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2019
Jan. 28, 2019
Mar. 29, 2018
Mar. 19, 2018
Feb. 28, 2018
Feb. 01, 2018
May 31, 2017
Apr. 21, 2017
Mar. 31, 2017
Mar. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2017
Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]                            
License revenue                     $ 0 $ 65,000    
Licensing Agreements | Symantec Corp                            
Finite-Lived Intangible Assets [Line Items]                            
Settlement, amount awarded from other party       $ 65,000                    
Payment period         20 days                  
Payable period of agreement         4 years                  
Licensing Agreements | EU Licensee                            
Finite-Lived Intangible Assets [Line Items]                            
Settlement, amount awarded from other party               $ 4,900            
Payment period               10 days            
Accounts receivable                           $ 1,300
Licensing Agreements | Sophos Group                            
Finite-Lived Intangible Assets [Line Items]                            
Settlement, amount awarded from other party                   $ 2,500        
Cash received from license agreement                 $ 15,000          
Maximum | Licensing Agreements | Symantec Corp                            
Finite-Lived Intangible Assets [Line Items]                            
Additional license fees         $ 45,000                  
License | Licensing Agreements | Symantec Corp                            
Finite-Lived Intangible Assets [Line Items]                            
License revenue                       $ 65,000    
License | Licensing Agreements | EU Licensee                            
Finite-Lived Intangible Assets [Line Items]                            
License revenue   $ 1,300       $ 1,300 $ 2,300           $ 2,300  
License | Licensing Agreements | Sophos Group                            
Finite-Lived Intangible Assets [Line Items]                            
License revenue $ 1,250   $ 1,250           $ 15,000