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Non-Controlling Interest Redeemable Convertible Preferred Stock (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2015
$ / shares
shares
Dec. 30, 2017
USD ($)
$ / shares
Dec. 30, 2017
USD ($)
d
$ / shares
Jul. 01, 2017
USD ($)
Redeemable Noncontrolling Interest [Line Items]        
Redemption value   $ 35,800,000 $ 35,800,000 $ 35,800,000
Declared dividend for preferred stock   0 $ 200,000  
Redeemable Convertible Series A Preferred Stock        
Redeemable Noncontrolling Interest [Line Items]        
Number of years before stock is redeemable at the holders' option     5 years  
Redemption value   $ 35,800,000 $ 35,800,000  
Conversion price per share (usd per share) | $ / shares $ 24.63      
Conversion price equal to the volume weighted average price per share (as a percent) 125.00%      
Number of regular-way trading days used to set conversion price | d     5  
Liquidation preference per share (usd per share) | $ / shares   $ 1,000 $ 1,000  
Annual dividend rate     2.50%  
Accrued dividends     $ 500,000 $ 200,000
Redeemable Convertible Series A Preferred Stock | Viavi        
Redeemable Noncontrolling Interest [Line Items]        
Number of shares sold (in shares) | shares 40,000      
Redeemable Convertible Series A Preferred Stock | Amada | Viavi        
Redeemable Noncontrolling Interest [Line Items]        
Number of shares sold (in shares) | shares 35,805      
Number of shares canceled (in shares) | shares 4,195