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Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 26, 2020 USD ($)	Sep. 26, 2020 USD ($) Employee	Sep. 28, 2019 USD ($)	Dec. 28, 2019 USD ($)	Jun. 27, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Percentage of reduction in headcount		35.00%
Number of majority employee | Employee		11
Expenses	$ 2,251	$ 13,459	$ 6,331
Expenses, after tax	1,680	9,996	4,727
Anticipates recording additional expenses in connection with restructuring	9,000	9,000
Payments for expenses	4,419	8,086		$ 5,077
Provisions	20	20		$ 83
Restructuring remaining liability	5,393	5,393
Revision in estimates	22,500	22,500			$ 14,000
Fiscal 2019
Restructuring Cost And Reserve [Line Items]
Payments for expenses		1,052
Provisions		119
Restructuring liability	0	0
Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Expenses	1,062	7,565	1,425
Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Expenses	$ 1,189	$ 5,894	$ 4,906

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