Segment information - Equity in Net Income of Joint Ventures Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Segment Reporting Disclosure [Line Items]
Net income (loss) of equity method investments	$ 15,198	$ 14,552	$ (41,745)
Corporate and Other
Segment Reporting Disclosure [Line Items]
Other	4,164	4,127	(53,575)
Operating segments
Segment Reporting Disclosure [Line Items]
Net income (loss) of equity method investments	11,034	10,425	11,830
Operating segments | Dunkin Donuts | International
Segment Reporting Disclosure [Line Items]
Net income (loss) of equity method investments	(83)	622	1,295
Operating segments | Baskin Robbins | International
Segment Reporting Disclosure [Line Items]
Net income (loss) of equity method investments	$ 11,117	$ 9,803	$ 10,535