Stock-based compensation (Tables)

9 Months Ended

Jul. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summarized Activity Related to Stock Options

The following table summarizes activity related to stock options for the nine months ended July 31, 2014:

	Number of Options			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value		Weighted Average Remaining Term
Outstanding at October 31, 2013		1,749		$	34.63
Granted		277		$	71.75
Exercised		(251	)	$	23.41
Forfeited or expired		(22	)	$	50.58
Outstanding at July 31, 2014		1,753		$	41.92	$	58,295		6.2 years
Vested or expected to vest at July 31, 2014		1,737		$	41.68	$	58,160		6.2 years
Exercisable at July 31, 2014		1,018		$	30.07	$	45,904		4.8 years

Fair Value Assumptions of Stock Options

The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:

Nine months ended	July 31, 2014	July 31, 2013
Expected volatility	40.1%-44.7%	45.3%-46.9%
Expected dividend yield	0.98%-1.03%	0.97%-1.01%
Risk-free interest rate	1.51%-1.79%	0.75%-0.90%
Expected life of the option (in years)	5.4-6.1	5.4-6.1

Summarized Activity Related to Restricted Stock

The following table summarizes activity related to restricted shares during the nine months ended July 31, 2014:

	Number of Shares			Weighted-Average Grant Date Fair Value
Restricted shares at October 31, 2013		82		$	52.67
Granted		23		$	71.89
Vested		(38	)	$	47.77
Restricted shares at July 31, 2014		67		$	62.10

Summarized Activity Related to Restricted Stock Units

The following table summarizes activity related to restricted share units during the nine months ended July 31, 2014:

	Number of Units			Weighted-Average Grant Date Fair Value
Restricted share units at October 31, 2013		12		$	51.79
Granted		12		$	71.82
Vested		(6	)	$	43.73
Restricted share units at July 31, 2014		18		$	68.71

Summarized Activity Related to Director Deferred Compensation Shares

The following table summarizes activity related to director deferred compensation share equivalent units during the nine months ended July 31, 2014:

	Number of Shares			Weighted-Average Grant Date Fair Value
Outstanding at October 31, 2013		148		$	23.22
Restricted stock units vested		6		$	43.73
Dividend equivalents		1		$	75.23
Distributions		(43	)	$	18.81
Outstanding at July 31, 2014		112		$	26.60