Long-Term Debt - Additional Information (Detail)	12 Months Ended
	Dec. 30, 2017 USD ($) LetterOfCredit	Nov. 30, 2017 USD ($)
Debt Instrument [Line Items]
Number of letters of credit outstanding | LetterOfCredit	2
$100 million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 100,000,000
Expiration date of credit facility	2022-12
Line of credit facility incremental borrowing capacity	$ 100,000,000
Line of credit facility unused fee percentage	0.10%
Interest rate of credit facility	2.22%
Borrowings under credit facility	$ 0
Amount available under credit facility, net of letters of credit	$ 99,200,000
$100 million Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
LIBOR basis points	65.00%
$100 million Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
LIBOR basis points	125.00%
$30 million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 30,000,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Borrowings under credit facility	$ 800,000