Stock-based compensation (Tables)

12 Months Ended

Oct. 31, 2011

Stock-based compensation (Tables) [Abstract]

Summarized activity related to stock options

	Number of Options			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value		Weighted-Average Remaining Term
Outstanding at October 31, 2010		2,362		$	20.15
Granted		287		$	43.32
Exercised		(787	)	$	18.92
Forfeited or expired		(11	)	$	28.20
Outstanding at October 31, 2011		1,851		$	24.22	$	41,011		6.2 years
Vested at October 31, 2011 or expected to vest		1,773		$	23.93	$	39,791		6.1 years
Exercisable at October 31, 2011		944		$	19.79	$	25,100		4.5 years

Fair value assumptions of stock options

	2011	2010
Expected volatility	.431-.451	.429-.442
Expected dividend yield	1.28%	1.35-1.40%
Risk-free interest rate	1.89%-2.25%	2.27-3.18%
Expected life of the option (in years)	5.4-6.3	5.4-6.3

Summarized activity related to nonvested shares

	Number of Shares			Weighted-Average Grant Date Fair Value Per Share
Nonvested at October 31, 2010		80		$	24.70
Granted		38		$	43.41
Vested		(36	)	$	21.11
Forfeited		(1	)	$	43.32
Nonvested at October 31, 2011		81		$	34.95

Summarized activity related to director deferred compensation shares

	Number of Shares			Weighted-Average Grant Date Fair Value Per Share
Outstanding at October 31, 2010		267		$	16.54
Deferrals		3		$	48.82
Restricted stock units vested		18		$	16.55
Dividend equivalents		2		$	47.99
Distributions		(47	)	$	15.27
Outstanding at October 31, 2011		243		$	17.51

Summarized information on currently outstanding options

	Range of Exercise Price
	$11 — $20		$21 — $28		$29 — $44
Number outstanding		843		655		353
Weighted-average remaining contractual life, in years		4.7		6.5		8.9
Weighted-average exercise price	$	15.69	$	26.22	$	40.85
Number exercisable		596		331		17
Weighted-average exercise price	$	16.24	$	25.62	$	30.70