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Summary of Significant Accounting Policies - Recent Accounting Standards Not Yet Adopted (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Dec. 29, 2019	Dec. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018
Recent Accounting Standards
CRA elected package of practical expedients	true
Operating lease right-of-use assets	$ 122,983			$ 130,173
BALANCE AT DECEMBER 28, 2019	202,215	$ 196,360	$ 197,548	197,751	$ 194,880	$ 197,890		$ 196,472
Cumulative-effect adjustment
Recent Accounting Standards
BALANCE AT DECEMBER 28, 2019			(203)
Retained Earnings
Recent Accounting Standards
BALANCE AT DECEMBER 28, 2019	$ 208,784	$ 204,679	200,046	$ 200,249	$ 193,191	$ 189,235		$ 186,229
Retained Earnings | Cumulative-effect adjustment
Recent Accounting Standards
BALANCE AT DECEMBER 28, 2019			(203)
ASU 2016-02
Recent Accounting Standards
Operating lease right-of-use assets							$ 82,300
Recognize lease liabilities							$ 106,800
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Retained Earnings | Cumulative-effect adjustment
Recent Accounting Standards
BALANCE AT DECEMBER 28, 2019			$ (200)

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Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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