Income taxes - Current and Deferred Tax Provisions (Benefits) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Disclosure Income Taxes Current And Deferred Tax Provisions Benefits [Abstract]
Domestic, current									$ (20,548)	$ (16,746)	$ 217,996
Foreign, current									67,037	86,006	62,684
State, current									(9,299)	8,044	11,676
Current Total									37,190	77,304	292,356
Deferred, Domestic									12,164	61,202	180,846
Deferred, Foreign									5,599	(42,446)	(15,098)
Deferred, State									24,054	7,855	(4,987)
Deferred, Total									41,817	26,611	160,761
Total, Domestic									(8,384)	44,456	398,842
Total, Foreign									72,636	43,560	47,586
Total, State									14,755	15,899	6,689
Total, Current and deferred tax provisions (benefits)	$ 9,864	$ 30,823	$ 25,274	$ 13,046	$ 39,629	$ 25,168	$ 24,211	$ 14,907	$ 79,007	$ 103,915	$ 453,117