Long-Term Debt - Additional Information (Detail) (USD $)	6 Months Ended
	Dec. 28, 2013
Unsecured private placement notes
Line of Credit Facility [Line Items]
Interest rate spread on notes (in percent)	0.60%
Long-term debt, notes	$ 75,000,000
Long-term debt maturities	Jun. 30, 2015
Outstanding balance, notes	75,000,000
Effective interest rate (in percent)	0.87%
Debt Instrument, description of variable rate basis	The notes bear interest at 0.60% over LIBOR
Debt instrument, frequency of periodic payment	The notes do not require principal payments until maturity
Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Long-term debt, notes	100,000,000
Outstanding balance, notes	100,000,000
Effective interest rate (in percent)	3.81%
Unsecured revolving credit facility
Line of Credit Facility [Line Items]
Revolving credit facility	250,000,000
Debt facility expiration date	Mar. 07, 2017
Borrowings outstanding under the revolving credit facility	2,000,000
Letters of credit sub-limit	50,000,000
Outstanding letters of credit	636,000
Fee payment on unused credit balances, percentage	0.20%
Debt amendment date	Apr. 12, 2013
Effective date of debt amendment, latest	Jun. 30, 2015
Effective interest rate (in percent)	3.25%
Line of credit facility, interest rate description	Borrowings in U.S. dollars under this credit facility generally bear interest at the adjusted London Interbank Offered Rate ("LIBOR") for specified interest periods plus a margin, which can range from 1.00% to 2.00%, depending on our consolidated leverage ratio. Additionally, we have access to a swingline facility under this line of credit as well as alternative base rate borrowings that are priced based on an agreed upon baseline rate plus a spread determined by the same consolidated leverage ratio.
Secured Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility	50,000,000
Debt facility expiration date	Sep. 27, 2016
Interest rate spread on notes (in percent)	0.75%
Interest Rate on Letters of Credit Outstanding	0.80%
Borrowings outstanding under the revolving credit facility	0
Outstanding letters of credit	26,225,000
Fee payment on unused credit balances, percentage	0.26%
Line of credit facility, interest rate description	We pay interest at a rate per annum equal to a margin of 0.75%, plus LIBOR.
Minimum | Unsecured revolving credit facility
Line of Credit Facility [Line Items]
Interest rate spread on notes (in percent)	1.00%
Maximum | Unsecured revolving credit facility
Line of Credit Facility [Line Items]
Interest rate spread on notes (in percent)	2.00%
Unsecured Senior Notes 1 [Member] | Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Long-term debt, notes	50,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.73%
Long-term debt maturities	Apr. 15, 2023
Unsecured Senior Notes 2 [Member] | Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Long-term debt, notes	$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.88%
Long-term debt maturities	Apr. 15, 2025