Discontinued Operations - Additional Information (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended	6 Months Ended
	Aug. 01, 2015	Jan. 02, 2016	Jan. 02, 2016	Dec. 31, 2016
Discontinued Operations
Stock conversion ratio in distribution	0.2
Net income tax provision (benefit) for discontinued operations		$ (4.5)
Spinoff | Lumentum
Discontinued Operations
Net income tax provision (benefit) for discontinued operations			$ 30.5
Transaction, advisory and other costs to effect the separation		$ 1.5	15.5
Spinoff | Lumentum | Discontinued Operations
Discontinued Operations
Net income tax provision			25.2
Spinoff | Lumentum | Federal and State
Discontinued Operations
Net income tax provision (benefit) for discontinued operations			$ 5.6
Lumentum
Discontinued Operations
Percentage of outstanding shares distributed	80.10%
Stock conversion ratio in distribution	0.2
Cash contributions agreed to in spin-off	$ 137.6
Retained ownership percentage	19.90%
Shares held in investment (in shares)	11.7			1.7
Minimum holding period for retained interest	6 months
Maximum holding period for retained interest	3 years