Revenue - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 02, 2021	Jan. 01, 2022	Jan. 02, 2021
Disaggregation of Revenue [Line Items]
Total net revenues	$ 52,128	$ 38,524	$ 52,128
TFE
Disaggregation of Revenue [Line Items]
Total net revenues		38,524	52,128
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	46,046	32,411
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		6,113	6,082
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues		34,331	51,700
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	45,620	28,300
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		6,031	6,080
DCP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues		17
DCP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		3
DCP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		14
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues		326	428
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	$ 426	258
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		68	$ 2
ASP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues		3,850
ASP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues		3,850
ASP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		$ 0