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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 28, 2019
Commitments and Contingencies Disclosure [Abstract]  
Activity related to the warranty accrual
Activity related to the warranty accrual was as follows (in thousands):
 
Fiscal Year Ended
 
December 28,
2019
 
December 29,
2018
 
December 30,
2017
Balance at beginning of period
$
11,964

 
$
11,264

 
$
8,464

Liability assumed (1)
—

 
—

 
2,186

Provision
14,091

 
10,798

 
8,591

Warranty usage
(12,199
)
 
(10,098
)
 
(7,977
)
Balance at end of period
$
13,856

 
$
11,964

 
$
11,264


 __________________________________
(1)
Warranty assumed as part of the acquisition of the iRobot-related distribution business of SODC.