Stock Options Outstanding (Detail) - $ / shares	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Oct. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Exercisable, Shares	922,706	826,496	752,943
$23.66 - $50.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 23.66
Range of Exercise Prices, upper limit	$ 50.00
Options Outstanding, Shares	200,771
Options Outstanding Weighted Average Remaining Life (years)	2 years 9 months 18 days
Options Outstanding, Weighted Average Price	$ 39.95
Options Exercisable, Shares	200,771
Options Exercisable, Weighted Average Price	$ 39.95
$50.01 - $52.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	50.01
Range of Exercise Prices, upper limit	$ 52.00
Options Outstanding, Shares	189,575
Options Outstanding Weighted Average Remaining Life (years)	4 years 4 months 24 days
Options Outstanding, Weighted Average Price	$ 51.06
Options Exercisable, Shares	189,575
Options Exercisable, Weighted Average Price	$ 51.06
$52.01 - $65.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	52.01
Range of Exercise Prices, upper limit	$ 65.00
Options Outstanding, Shares	321,660
Options Outstanding Weighted Average Remaining Life (years)	3 years 8 months 12 days
Options Outstanding, Weighted Average Price	$ 60.63
Options Exercisable, Shares	300,310
Options Exercisable, Weighted Average Price	$ 60.63
$65.01 - $80.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	65.01
Range of Exercise Prices, upper limit	$ 80.00
Options Outstanding, Shares	190,350
Options Outstanding Weighted Average Remaining Life (years)	7 years 1 month 6 days
Options Outstanding, Weighted Average Price	$ 73.16
Options Exercisable, Shares	93,100
Options Exercisable, Weighted Average Price	$ 70.37
$80.01 - $100.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	80.01
Range of Exercise Prices, upper limit	$ 100.00
Options Outstanding, Shares	313,550
Options Outstanding Weighted Average Remaining Life (years)	8 years
Options Outstanding, Weighted Average Price	$ 94.83
Options Exercisable, Shares	87,225
Options Exercisable, Weighted Average Price	$ 94.37
$100.01 - $118.32
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	100.01
Range of Exercise Prices, upper limit	$ 118.32
Options Outstanding, Shares	183,050
Options Outstanding Weighted Average Remaining Life (years)	8 years
Options Outstanding, Weighted Average Price	$ 109.57
Options Exercisable, Shares	51,725
Options Exercisable, Weighted Average Price	$ 109.72