CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Statement of Financial Position [Abstract]
Net of allowance for doubtful accounts	$ 4,014	$ 4,005
Commitments and contingencies (Note 13)
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	183,198,000	181,134,000
Common stock, shares outstanding (in shares)	183,198,000	181,134,000

Amount of allowance for credit loss on accounts receivable, classified as current.

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