Acquisition of Petsense (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Sep. 29, 2016
Consideration Transferred						$ 144,476
Current Assets						21,875
Property and Equipment						25,519
Indefinite-lived Intangible Assets Acquired	$ 31,300	$ 31,300				31,300
Other Assets						428
Long-term liabilities						(5,489)
Total identifiable net assets acquired						61,542
Excess of consideration transferred over identifiable net assets acquired (goodwill)						82,934
Goodwill, Purchase Accounting Adjustments				$ 0	$ (1,225)
Current Liabilities						$ (12,091)