Other - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended				12 Months Ended
	Sep. 29, 2019	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018	Sep. 30, 2019
Other Expense [Line Items]
Capital expenditures related to restructuring costs (less than)							$ 1,000,000
Marketing expense						$ 135,900,000	167,900,000	$ 156,300,000
Media expense						129,600,000	156,900,000	131,500,000
Restructuring charge		$ 0	$ 4,008,000	$ 0	$ 0	0	4,008,000	0
Severance liability		8,400,000				5,000,000.0	8,400,000
Retired assets						123,000,000.0
Software
Other Expense [Line Items]
Retired assets						69,500,000
Equipment
Other Expense [Line Items]
Retired assets						49,900,000
Revolving Credit Facility
Other Expense [Line Items]
Unsecured revolving credit facility, maximum borrowing capacity									$ 250,000,000.0
Line of credit facility, expiration period (in years)	5 years
Unsecured revolving credit facility, unused commitment fee (percent)	0.20%
Long-term line of credit						0
Capitalized Computer Software Costs
Other Expense [Line Items]
Amortization of capitalized computer software						14,700,000	17,000,000.0	15,700,000
Unamortized intangible assets		$ 26,400,000				18,900,000	26,400,000
Headquarters Redesign and Consolidation
Other Expense [Line Items]
Total restructuring costs incurred								4,500,000
Employee Severance | Selling, General and Administrative Expenses
Other Expense [Line Items]
Severance costs						$ 6,600,000	$ 4,000,000.0	$ 6,700,000