Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Significant Accounting Policies [Line Items]
Sales	$ 749,442,000	$ 717,282,000	$ 681,561,000	$ 898,206,000	$ 653,566,000	$ 675,369,000	$ 642,596,000	$ 801,825,000	$ 3,046,491,000	$ 2,773,356,000	$ 2,573,769,000
Inventory	91,010,000				74,096,000				91,010,000	74,096,000
Deferred gain on sale of assets held for sale	17,300,000				16,900,000				17,300,000	16,900,000
Net gain on sale of territories									2,600,000	2,400,000	4,200,000
Shipping costs									675,600,000	630,100,000	577,300,000
Equipment held under capital leases	15,600,000				11,600,000				15,600,000	11,600,000
Total accumulated depreciation for assets held under capital leases	5,600,000				3,600,000				5,600,000	3,600,000
Depreciation expense									93,400,000	87,500,000	79,100,000
Advertising and marketing costs									19,100,000	16,800,000	14,400,000
Amortization expense of capitalized software development costs									1,600,000	1,400,000	1,700,000
Capitalized software development costs	7,500,000				6,400,000				7,500,000	6,400,000
Plan asset amortization conditional percentage									10.00%
Pay By Scan
Significant Accounting Policies [Line Items]
Sales									863,400,000	821,000,000	744,700,000
Inventory	5,600,000				5,000,000				5,600,000	5,000,000
Maximum
Significant Accounting Policies [Line Items]
Percentage of distributor route notes receivables									10.00%
Gain on sale of territories recognized immediately									$ 5,000
Maximum | Building
Significant Accounting Policies [Line Items]
Estimated useful life, years									40 years
Maximum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Estimated useful life, years									25 years
Maximum | Furniture Fixtures And Transportation Equipment
Significant Accounting Policies [Line Items]
Estimated useful life, years									15 years
Maximum | Capitalized Software Development Costs
Significant Accounting Policies [Line Items]
Estimated useful life, years									8 years
Maximum | Sale of Territory
Significant Accounting Policies [Line Items]
Notes receivable maturity period									10 years
Minimum | Building
Significant Accounting Policies [Line Items]
Estimated useful life, years									10 years
Minimum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Estimated useful life, years									3 years
Minimum | Furniture Fixtures And Transportation Equipment
Significant Accounting Policies [Line Items]
Estimated useful life, years									3 years
Minimum | Capitalized Software Development Costs
Significant Accounting Policies [Line Items]
Estimated useful life, years									3 years
Top 10 Customers
Significant Accounting Policies [Line Items]
Percentage of sales									45.10%	45.60%	46.50%