Discontinued Operations (Details) - USD ($)		3 Months Ended			6 Months Ended
	Aug. 01, 2015	Jan. 02, 2016	Oct. 03, 2015	Dec. 27, 2014	Jan. 02, 2016	Dec. 27, 2014	Jul. 31, 2015	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
Cash contributions remaining		$ 900,000			$ 900,000
Proceeds from sale of Lumentum Holdings Inc. Series A Preferred Stock					35,800,000	$ 0
Net revenue under Supply Agreement		232,100,000		$ 226,400,000	461,800,000	441,700,000
Accumulated other comprehensive loss transferred to Lumentum	7,800,000				7,800,000
Net operating losses used to offset income and gain recognized on separation					1,000,000,000
Income (loss) from discontinued operations, net of taxes		3,000,000		12,600,000	(50,400,000)	28,700,000
Tax benefit from discontinued operations		4,500,000
Spinoff | Lumentum
Discontinued Operations
Deferred tax assets	29,500,000
Deferred tax liabilities	1,000,000
Income taxes payable	3,300,000							$ 3,700,000
Current income tax receivables	1,300,000
Other long-term liabilities related to uncertain tax positions	$ 100,000
Net income tax provision for discontinued operations				300,000	30,500,000	600,000
Transaction, advisory and other costs to effect the separation		1,500,000		$ 3,300,000	15,500,000	$ 3,700,000
Spinoff | Lumentum | Discontinued Operations
Discontinued Operations
Net income tax provision					25,200,000
Spinoff | Lumentum | Federal and State
Discontinued Operations
Net income tax provision for discontinued operations					5,600,000
Lumentum
Discontinued Operations
Retained ownership percentage	19.90%
Series A Preferred Stock
Discontinued Operations
Proceeds from sale of Lumentum Holdings Inc. Series A Preferred Stock			$ 35,800,000
Shares canceled in transaction (in shares)			4,195
Viavi Solutions | Series A Preferred Stock | Lumentum
Discontinued Operations
Number of shares sold (in shares)	40,000
Lumentum | Supply Commitment
Discontinued Operations
Supply Agreement with Lumentum amount							$ 15,000,000
Net revenue under Supply Agreement		$ 3,800,000			$ 8,300,000
Amada | Series A Preferred Stock
Discontinued Operations
Number of shares sold (in shares)			35,805
Lumentum
Discontinued Operations
Retained ownership percentage	19.90%
Shares held in investment	11,700,000	11,700,000			11,700,000