Interest Expense on Convertible Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Debt Instrument
Contractual interest expense on the coupon	$ 355	$ 1,438	$ 2,666	$ 4,313
Amortization of the discount component and debt issue fees recognized as interest expense	2,424	3,887	9,771	11,518
Total interest expense on the convertible debt	$ 2,779	$ 5,325	$ 12,437	$ 15,831

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration