Revenue - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Disaggregation of Revenue [Line Items]
Total net revenues	$ 9,631	$ 11,542
TFE
Disaggregation of Revenue [Line Items]
Total net revenues		11,542
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		10,535
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		1,007
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	9,631	11,524
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	8,119	10,517
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	$ 1,512	1,007
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues		18
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		18
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		$ 0