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Defined Benefit Plans
 6 Months Ended
Mar. 31, 2018
Postemployment Benefits [Abstract]  
Defined Benefits Plans
DEFINED BENEFIT PLANS
 
Components of net periodic cost were as follows for the three and six months ended March 31, 2018 and April 1, 2017 (in thousands):

 
Three Months Ended
 
Six Months Ended
 
March 31,
2018
 
April 1,
2017
 
March 31,
2018
 
April 1,
2017
Service cost
$
362

 
$
458

 
$
827

 
$
843

Interest cost
160

 
262

 
355

 
450

Expected return on plan assets
(99
)
 
(184
)
 
(198
)
 
(306
)
Amortization of prior service cost
40

 
19

 
102

 
31

Amortization of prior net loss
—

 
139

 
—

 
231

Amortization of unrecognized gain from OCI
(489
)
 
—

 
(614
)
 
—

Recognized net actuarial loss
62

 
228

 
43

 
458

Net periodic pension cost
$
36

 
$
922

 
$
515

 
$
1,707