Debt - Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended	0 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Dec. 29, 2013	Oct. 16, 2014 Subsequent Event [Member]	Sep. 28, 2014 Three Hundred Fifty Million Facility[Member]	Oct. 16, 2014 Three Hundred Fifty Million Facility[Member] Subsequent Event [Member]	Oct. 16, 2014 Three Hundred Fifty Million Facility[Member] Subsequent Event [Member]	Sep. 28, 2014 5.30% Senior Notes 2015 [Member]	Dec. 29, 2013 5.30% Senior Notes 2015 [Member]	Sep. 29, 2013 5.30% Senior Notes 2015 [Member]	Sep. 28, 2014 Line of Credit [Member]	Dec. 29, 2013 Line of Credit [Member]	Sep. 29, 2013 Line of Credit [Member]	Oct. 16, 2014 Maximum [Member] Subsequent Event [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit agreement	$ 200,000,000			$ 350,000,000			$ 350,000,000
Period of unsecured revolving credit agreement						5 years
Maturity date of debt instruments					Oct. 16, 2019			Apr. 30, 2015
Amount available for issuance of letters of credit from revolving credit facility														50,000,000
Unsecured revolving credit agreement, maximum borrowing capacity				450,000,000
Annual facility fee, percentage						0.15%
Outstanding borrowings on unsecured revolving credit agreement	50,000,000	20,000,000	5,000,000
Amount available to meet cash requirements under the revolving credit facility	150,000,000
Senior notes, amount								100,000,000	100,000,000	100,000,000
Outstanding borrowing on uncommitted line of credit											20,000,000	20,000,000	20,000,000
Uncommitted line of credit, weighted average interest rate											0.90%	0.88%	0.93%
Weighted average interest rate on debt and capital lease obligations spot rate	5.80%	6.10%	6.20%
Overall weighted average interest rate on debt and capital lease obligations	5.80%	5.80%
Debt and capital lease obligations subject to changes in short-term interest rates	70,000,000
Debt and capital lease obligations	504,300,000
Debt issued by subsidiaries	0
Guarantees of company debt	$ 0