Stock-based compensation (Tables)

3 Months Ended

Jan. 31, 2012

Stock-based compensation [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, 2011		1,851		$	24.22
Granted		299		$	43.73
Exercised		(28	)	$	19.26
Forfeited or expired		(9	)	$	28.11
Outstanding at January 31, 2012		2,113		$	27.03	$	38,698		6.5 years
Vested or expected to vest at January 31, 2012		2,043		$	26.69	$	38,109		6.4 years
Exercisable at January 31, 2012		1,232		$	21.47	$	29,400		5.0 years

Fair value assumptions of stock options

Three months ended	January 31, 2012	January 31, 2011
Expected volatility	.454-.469	.431-.451
Expected dividend yield	1.20%	1.28%
Risk-free interest rate	1.03%-1.23%	1.89%-2.25%
Expected life of the option (in years)	5.4-6.1	5.4-6.3

Summarized activity related to nonvested shares

	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested shares at October 31, 2011		81		$	34.95
Granted		44		$	43.30
Vested		(16	)	$	34.52
Forfeited		(1	)	$	43.32
Nonvested shares at January 31, 2012		108		$	38.35

Summarized activity related to director deferred compensation shares

	Number of Shares			Weighted-Average Grant Date Fair Value
Outstanding at October 31, 2011		243		$	17.51
Granted		1		$	45.34
Restricted stock units vested		9		$	27.48
Dividend equivalents		1		$	41.59
Distributions		(15	)	$	15.76
Outstanding at January 31, 2012		239		$	18.12