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Defined Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2018
Postemployment Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Components of net periodic cost were as follows for the three and nine months ended June 30, 2018 and July 1, 2017 (in thousands):

 
Three Months Ended
 
Nine Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Service cost
$
424

 
$
566

 
$
1,251

 
$
1,409

Interest cost
194

 
279

 
549

 
729

Expected return on plan assets
(99
)
 
(184
)
 
(297
)
 
(490
)
Amortization of prior service cost
64

 
19

 
166

 
50

Amortization of prior net loss
—

 
139

 
—

 
370

Amortization of unrecognized gain from OCI
(503
)
 
—

 
(1,117
)
 
—

Recognized net actuarial loss
(69
)
 
387

 
(26
)
 
845

Net periodic pension cost
$
11

 
$
1,206

 
$
526

 
$
2,913