Investments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Debt Securities, Available-for-sale [Line Items]
Investments maximum maturity period	5 years
Unrealized gain (loss), net of unrealized gains/losses, on the investments in the bond portfolio	$ 144,000	$ 3,578,000
Insurance [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted Cash and Cash Equivalents	4,049,000
Guarantee Payment of Insurance Claims
Debt Securities, Available-for-sale [Line Items]
Letters of credit outstanding	72,267,000
Current Investments
Debt Securities, Available-for-sale [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	31,729,000
Non-Current Investments
Debt Securities, Available-for-sale [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	44,069,000
Total non-current investments	$ 139,864,000