Stock-based compensation (Tables)

9 Months Ended

Jul. 31, 2011

Stock-based compensation (Tables) [Abstract]

Summarized activity related to stock options

								Weighted
				Weighted-Average				Average
	Number of			Exercise Price Per		Aggregate		Remaining
	Options			Share		Intrinsic Value		Term
Outstanding at October 31, 2010		2,362		$	20.15
Granted		287		$	43.32
Exercised		(784	)	$	18.94
Forfeited or expired		(9	)	$	26.47
Outstanding at July 31, 2011		1,856		$	24.21	$	49,786	6.4 years
Vested or expected to vest at July 31, 2011		1,778		$	23.92	$	48,191	6.3 years
Exercisable at July 31, 2011		947		$	19.77	$	29,616	4.8 years

Fair value assumptions of stock options

Nine months ended	July 31, 2011			July 31, 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

				Weighted-Average
	Number of			Grant Date Fair
	Shares			Value
Nonvested shares at October 31, 2010		80		$	24.70
Granted		38		$	43.41
Vested		(32	)	$	19.34
Forfeited		(1	)	$	43.32
Nonvested shares at July 31, 2011		85		$	34.86

Summarized activity related to director deferred compensation shares

				Weighted-Average
	Number of			Grant Date Fair
	Shares			Value
Outstanding at October 31, 2010		267		$	16.54
Deferrals		2		$	49.34
Restricted stock units vested		18		$	16.55
Dividend equivalents		2		$	50.40
Distributions		(32	)	$	15.06
Outstanding at July 31, 2011		257		$	17.27