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Acquisitions and Divestitures (Tables)
 12 Months Ended
Sep. 30, 2018
Business Combinations [Abstract]  
Summary of changes in the carrying value of estimated contingent earn-out liabilities
The following table summarizes the changes in the carrying value of estimated contingent earn-out liabilities:
 
Fiscal Year Ended
 
September 30,
2018
 
October 1,
2017
 
October 2,
2016
 
(in thousands)
Beginning balance (at fair value)
$
2,438

 
$
8,757

 
$
4,169

Estimated earn-out liabilities for acquisitions during the fiscal year
32,210

 
1,604

 
4,745

Increases due to re-measurement of fair value reported in interest expense
1,005

 
260

 
271

Net increase (decrease) due to re-measurement of fair value reported as losses (gains) in operating income
4,252

 
(6,923
)
 
2,823

Foreign exchange impact
(854
)
 
59

 
—

Earn-out payments:
 

 
 

 
 

Reported as cash used in operating activities
(2,349
)
 
—

 
—

Reported as cash used in financing activities
(1,412
)
 
(1,319
)
 
(3,251
)
Ending balance (at fair value)
$
35,290

 
$
2,438

 
$
8,757