Share-Based Payments - Additional Information (Detail) - USD ($)	12 Months Ended
	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense related to stock options and share purchase plans	$ 38,244,000	$ 39,825,000	$ 40,995,000
Share-based compensation expense for unvested awards not yet recognized in earnings	$ 37,900,000
Weighted average period recognition of share-based compensation expense for unvested awards	1 year 11 months 23 days
Excess tax benefit		$ 63,700,000	$ 47,900,000
Term of options from grant date	10 years or 10 years and one day
Exercise period of vested options after death	1 year
Restricted stock units granted under Director Compensation Program, description	Under the 2011 Program, restricted stock units are granted the first day of each calendar quarter. The number of restricted stock units granted each quarter is determined by dividing one-fourth of the amount of the annual retainer by the fair market value of the shares of common stock as of the grant date
Outstanding options	1,798,055	1,759,408
Common stock reserved for future issuance	178,300
Weighted average grant date fair value of options granted	$ 139.80	$ 156.20	$ 106.27
Intrinsic value of options exercised	$ 93,900,000	$ 178,000,000	$ 154,800,000
Total fair value of options vested	34,700,000	32,200,000	30,600,000
Expense related to the discount on the selling of shares to employees and executives	$ 1,800,000	$ 2,000,000	$ 2,100,000
Percent of market price at which employees permitted to purchase through payroll deductions	85.00%
Maximum permitted annual purchases per employee	$ 15,000
Maximum permitted annual purchases per employee, Percent of Compensation	10.00%
Shares sold to employees under employee stock purchase plan	14,205	12,662	14,222
Shares purchased from employees at fair value	12,455	12,460	15,594
2003 Comp Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum limit of the fees a Director can elect to receive in stock	100.00%
Accrued Director fees	$ 9,500,000	$ 13,600,000
Accrued Director fees in shares	17,990	17,990
Additional shares of stock or units	0
2003 Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares for which each new non-employee director receives an option to purchase	3,000
2003 Option Plan [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding options	19,000	24,000
Common stock reserved for future issuance	0
Share based compensation grant date vesting period	3 years
Restated Executive Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	239,888
Maximum permitted annual purchases per employee, Percent of Compensation	25.00%
Shares sold to employees under employee stock purchase plan	1,865	1,943	2,229
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of vested options after service period	30 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of vested options after service period	90 days