Stockholders' equity (deficit) Changes in Components of Accumulated Other Comprehensive Income (Detail) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($)
Movement in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (23,984)
Other comprehensive income (loss)	14,294
Balance at end of period	(9,690)
Other
Movement in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,109)
Other comprehensive income (loss)	658
Balance at end of period	(1,451)
Effect of foreign currency translation
Movement in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(23,019)
Other comprehensive income (loss)	14,780
Balance at end of period	(8,239)
Unrealized gains (losses) on interest rate swaps
Movement in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	1,144
Other comprehensive income (loss)	(1,144)
Balance at end of period	$ 0