Revenue Recognition - Concentration Risk (Details)	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Product Information [Line Items]
Concentration percent	100.00%	100.00%	100.00%	100.00%
Grocery [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	85.90%	87.70%	86.20%	88.40%
Pharmacy [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	9.30%	8.90%	9.50%	8.60%
Fuel [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	4.60%	3.20%	4.10%	2.80%
Manufacturing [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	0.20%	0.20%	0.20%	0.20%