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Discontinued Operations - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 01, 2015
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Oct. 03, 2015
Jul. 01, 2017
Jul. 02, 2016
Jun. 27, 2015
Discontinued Operations                        
Percentage of outstanding shares distributed 80.10%                      
Stock conversion ratio in distribution 0.2                      
Cash contributions agreed to in spin-off $ 137,600,000                      
Proceeds from sale of Lumentum Holdings Inc. Series A Preferred Stock                   $ 0 $ 35,800,000 $ 0
Net revenue under Supply Agreement   $ 198,100,000 $ 196,000,000 $ 206,500,000 $ 210,800,000 $ 224,100,000 $ 220,400,000 $ 232,100,000 $ 229,700,000 811,400,000 906,300,000 873,900,000
Accumulated other comprehensive loss transferred to Lumentum 7,800,000                      
Net operating losses used to offset income and gain recognized on separation                     1,000,000,000  
Spinoff | Lumentum                        
Discontinued Operations                        
Deferred tax assets 29,500,000                      
Deferred tax liabilities 1,000,000                      
Income taxes payable 3,300,000                      
Current income tax receivables 1,300,000                      
Other long-term liabilities related to uncertain tax positions 100,000                      
Net income tax (benefit) provision for discontinued operations                   $ (800,000) 27,800,000 (20,900,000)
Transaction, advisory and other costs to effect the separation                     16,500,000 $ 21,400,000
Spinoff | Lumentum | Discontinued Operations                        
Discontinued Operations                        
Net income tax provision                     19,000,000  
Spinoff | Lumentum | Federal and State                        
Discontinued Operations                        
Net income tax (benefit) provision for discontinued operations                     6,200,000  
Lumentum | Supply Commitment                        
Discontinued Operations                        
Supply Agreement with Lumentum amount $ 15,000,000                      
Net revenue under Supply Agreement                     14,100,000  
Amada | Series A Preferred Stock                        
Discontinued Operations                        
Number of shares sold (in shares)                 35,805      
Proceeds from sale of Lumentum Holdings Inc. Series A Preferred Stock                 $ 35,800,000   $ 35,800,000  
Shares canceled in transaction (in shares)                 4,195      
Lumentum                        
Discontinued Operations                        
Retained ownership percentage 19.90%                      
Shares held in investment (in shares) 11,700,000                      
Minimum holding period for retained interest 6 months                      
Maximum holding period for retained interest 3 years                      
Lumentum                        
Discontinued Operations                        
Percentage of outstanding shares distributed 80.10%                      
Lumentum | Viavi Solutions | Series A Preferred Stock                        
Discontinued Operations                        
Number of shares sold (in shares) 40,000