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Discontinued Operations - Supplemental Cash Flow and Other Disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Operating activities:        
Depreciation expense     $ 22.2 $ 29.8
Amortization of other intangibles $ 3.5 $ 3.6 10.4 11.1
Stock-based compensation expense $ 8.1 $ 9.1 $ 25.9 34.0
Spinoff | Discontinued Operations | Lumentum        
Operating activities:        
Depreciation expense       3.7
Amortization of other intangibles       0.6
Stock-based compensation expense       1.6
Investing activities:        
Capital expenditures       $ 5.8