Revenue Recognition - Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 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%	89.90%	86.40%	88.90%
Pharmacy [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	9.70%	7.80%	9.60%	8.40%
Fuel [Member] | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk [Member]
Product Information [Line Items]
Concentration percent	4.20%	2.10%	3.80%	2.50%
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%