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Joint Venture - Narrative (Details) $ in Millions		3 Months Ended								12 Months Ended
	Jul. 17, 2017 USD ($) board_member	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 30, 2018 USD ($)	Sep. 23, 2018 USD ($)	Jun. 24, 2018 USD ($)	Mar. 25, 2018 USD ($)	Dec. 24, 2017 USD ($)	Sep. 24, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 24, 2018 USD ($)	Jun. 25, 2017 USD ($)
Noncontrolling Interest [Line Items]
Proceeds from issuing Cree Venture LED stock to noncontrolling interest										$ 0.0	$ 4.9	$ 0.0
Net income attributable to noncontrolling interest		$ (0.1)	$ 0.1	$ 0.0	$ 0.0	$ 0.0	$ 0.1	$ 0.0	$ 0.0	0.0	0.1	$ 0.0
Cree Venture LED
Noncontrolling Interest [Line Items]
Number of board members | board_member	5
Number of board members designated by parent | board_member	3
Number of board members designated by noncontrolling owners | board_member	2
Cree Venture LED
Noncontrolling Interest [Line Items]
Payments to acquire interest in joint venture	$ 5.1
Ownership interest by parent (as a percent)	51.00%
Ownership interest by noncontrolling owners (as a percent)	49.00%
Net income attributable to noncontrolling interest										$ 0.0	$ 0.1
Cree Venture LED | San'an Optoelectronics Co., Ltd.
Noncontrolling Interest [Line Items]
Proceeds from issuing Cree Venture LED stock to noncontrolling interest	$ 4.9
Ownership interest by noncontrolling owners (as a percent)	49.00%

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