Benefit Plans - Pension Assets by Percentage (Details) - Pension Benefits	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Asset category [Abstract]
Total plan assets (as a percent)	100.00%	100.00%
Expected long-term rate of return on plan assets	4.96%	4.69%
Equity securities (includes equity mutual funds)
Asset category [Abstract]
Total plan assets (as a percent)	66.00%	66.00%
Multi-asset securities
Asset category [Abstract]
Total plan assets (as a percent)	24.00%	24.00%
Cash and money market funds
Asset category [Abstract]
Total plan assets (as a percent)	0.00%	1.00%
Alternative investments
Asset category [Abstract]
Total plan assets (as a percent)	10.00%	9.00%
Maximum | Equity securities (includes equity mutual funds)
Asset category [Abstract]
Total plan assets (as a percent)	70.00%
Maximum | Alternative investments
Asset category [Abstract]
Total plan assets (as a percent)	10.00%