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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 12 Months Ended
Jan. 01, 2017
Equity [Abstract]  
Schedule of Comprehensive Income (Loss)
Changes in the balance of each component of accumulated other comprehensive income (loss) during the years ended December 31, 2017 and January 1, 2017 were as follows:
 
Years ended
 
December 31, 2017
 
January 1, 2017
(in thousands)
Balance at beginning of period
Current period other comprehensive income
Balance at end of period
 
Balance at beginning of period
Current period other comprehensive income
Balance at end of period
Foreign currency translation adjustment
$
(11,684
)
$
3,355

$
(8,329
)
 
$
(13,514
)
$
1,830

$
(11,684
)
Unrealized gain (loss) on investments (1)
251

1,274

1,525

 
(499
)
750

251

Total other comprehensive income (loss), net of tax
$
(11,433
)
$
4,629

$
(6,804
)
 
$
(14,013
)
$
2,580

$
(11,433
)


(1)
Consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities. The tax impact on unrealized gain on available-for-sale securities was $0.5 million for fiscal 2017 and de minimis for fiscal 2016.