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REVENUE AND CONTRACT LIABILITIES (Tables)
 3 Months Ended
Dec. 28, 2019
Revenue from Contract with Customer [Abstract]  
Contract Liabilities
The following table shows the changes in contract liability balances during the three months ended December 28, 2019 and December 29, 2018:
 
Three months ended
(in thousands)
December 28, 2019
 
December 29, 2018

Contract liabilities, beginning of period
$
1,896

 
$
997

Revenue recognized
(3,358
)
 
(3,178
)
Additions
4,050

 
2,729

Contract liabilities, end of period
$
2,588

 
$
548