Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 30, 2017

Receivables [Abstract]

Summary of Activity in Allowance for Doubtful Accounts

A summary of the activity in the allowance for doubtful accounts for the last three fiscal years is as follows (in thousands):

	2017			2016			2015
Balance at beginning of year	$	25,388		$	22,623		$	24,989
Charged to costs and expenses		17,999			11,112			12,103
Customer accounts written off—net of recoveries		(17,416	)		(8,347	)		(14,469	)
Balance at end of year	$	25,971		$	25,388		$	22,623