Cash and cash equivalents (Detail) - USD ($) $ in Thousands	Dec. 29, 2023	Dec. 30, 2022
Cash
Fair Value Measurements [Line Items]
Amortized Cost	$ 132,464	$ 109,299
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	132,464	109,299
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	54,686	52,159
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	54,686	52,159
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	54,686	52,159
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	54,686	52,159
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	187,150	161,458
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	$ 187,150	$ 161,458