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Components of Interest Expense from Convertible Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2020	Dec. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Contractual coupon interest	$ 4,180	$ 4,374	$ 4,375
Amortization of debt discount	9,926	9,751	9,142
Amortization of debt issuance costs	$ 995	$ 977	$ 916

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- Definition

Convertible Notes, Contractual Coupon Interest

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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