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Retirement Savings Plan - Narrative (Details) $ in Millions	12 Months Ended
	Jun. 30, 2019 USD ($) plans	Jun. 24, 2018 USD ($)	Jun. 25, 2017 USD ($)
Retirement Benefits [Abstract]
Number of employee benefit plans | plans	1
Employer discretionary contribution amount | $	$ 7.9	$ 5.8	$ 4.9

X

- Definition

Employee Benefit Retirement Savings Plans, Number Of Plans

+ References

No definition available.

+ Details

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Namespace Prefix:	cree_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration