Benefit Plans - Summary of Pension Plan Assets Held in Trust Funds (Detail) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets held in trust funds	$ 276,085	$ 255,389
Pension Plan Assets Held in Trust Funds - Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets held in trust funds	179,153	164,307
Pension Plan Assets Held in Trust Funds - Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets held in trust funds	89,861	86,107
Pension Plan Assets Held in Trust Funds - Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets held in trust funds	$ 7,071	$ 4,975