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Defined Benefit Plans
 3 Months Ended
Dec. 30, 2017
Postemployment Benefits [Abstract]  
Defined Benefits Plans
15.  DEFINED BENEFIT PLANS
 
Components of net periodic cost were as follows for the three months ended December 30, 2017 and December 31, 2016 (in thousands):

 
Three Months Ended
 
December 30,
2017
 
December 31,
2016
Service cost
$
469

 
$
385

Interest cost
195

 
189

Expected return on plan assets
(99
)
 
(123
)
Amortization of prior service cost
62

 
93

Amortization of prior net loss
—

 
13

Amortization of unrecognized gain from OCI
(125
)
 
—

Recognized net actuarial (gain) loss
(23
)
 
230

Net periodic pension cost
$
479

 
$
787