Summary Stock Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	773,839
Options Exercisable	379,389
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 18 days
Options Exercisable, Weighted Average Contractual Life (Years)	4 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price per Share	$ 46.92
Options Exercisable, Weighted Average Exercise Price	$ 44.61
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 35.64
Maximum Exercise Price	$ 40.00
Options Outstanding	110,312
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price per Share	$ 37.13
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 40.01
Maximum Exercise Price	$ 45.00
Options Outstanding	275,921
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price per Share	$ 42.29
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 45.01
Maximum Exercise Price	$ 58.06
Options Outstanding	387,606
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price per Share	$ 53.00
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 35.64
Maximum Exercise Price	$ 40.00
Options Exercisable	67,362
Options Exercisable, Weighted Average Contractual Life (Years)	4 years 4 months 24 days
Options Exercisable, Weighted Average Exercise Price	$ 36.85
Range Five
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 40.01
Maximum Exercise Price	$ 45.00
Options Exercisable	184,121
Options Exercisable, Weighted Average Contractual Life (Years)	3 years 7 months 6 days
Options Exercisable, Weighted Average Exercise Price	$ 42.56
Range Six
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Exercise Price	$ 45.01
Maximum Exercise Price	$ 56.40
Options Exercisable	127,906
Options Exercisable, Weighted Average Contractual Life (Years)	6 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price	$ 51.64