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Allowance for doubtful accounts
 12 Months Ended
Dec. 30, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Allowance for doubtful accounts
Allowance for doubtful accounts
The changes in the allowance for doubtful accounts were as follows (in thousands):
 
Accounts
receivable
 
Short-term notes and other
receivables
 
Long-term notes and other
receivables
Balance at December 27, 2014
$
3,882

 
1,278

 
3,947

Provision for (recovery of) doubtful accounts, net
3,705

 
(117
)
 
(245
)
Write-offs and other
(1,960
)
 
(154
)
 
373

Balance at December 26, 2015
5,627

 
1,007

 
4,075

Provision for (recovery of) doubtful accounts, net
1,202

 
(189
)
 
(960
)
Write-offs and other
(2,051
)
 
(479
)
 
(1,027
)
Balance at December 31, 2016
4,778

 
339

 
2,088

Provision for doubtful accounts, net
123

 
264

 
70

Write-offs and other
(968
)
 
—

 
(335
)
Balance at December 30, 2017
$
3,933

 
603

 
1,823