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Discontinued Operations - Narrative (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 25, 2017	May 13, 2019
Lighting Products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate net proceeds from sale of business unit				$ 219,000,000.0
Loss on sale	$ 66,200,000	$ 0	$ 0
Accounts receivable, net		$ 67,500,000
Transmission Service Agreement | Sales, general and administrative
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued administrative fees	1,600,000
LED Supply Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	2,100,000
Accounts receivable, net	0
Contract liability	$ 13,400,000

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