Stock-based compensation (Tables)

3 Months Ended

Jan. 31, 2013

Summarized Activity Related to Stock Options

The following table summarizes activity related to stock options for the three months ended January 31, 2013:

	Number of Options			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value		Weighted Average Remaining Term
Outstanding at October 31, 2012		1,764		$	28.35
Granted		278		$	61.59
Exercised		(153	)	$	20.48
Forfeited or expired		(5	)	$	36.02
Outstanding at January 31, 2013		1,884		$	33.87	$	63,584		6.7 years
Vested or expected to vest at January 31, 2013		1,838		$	33.50	$	62,714		6.6 years
Exercisable at January 31, 2013		1,071		$	24.84	$	45,828		5.3 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:

Three months ended	January 31, 2013	January 31, 2012
Expected volatility	45.3%-46.9%	45.4%-46.9%
Expected dividend yield	1.01%	1.20%
Risk-free interest rate	0.75%-0.90%	1.03%-1.23%
Expected life of the option (in years)	5.4-6.1	5.4-6.1

Summarized Activity Related to Nonvested Shares

The following table summarizes activity related to nonvested shares during the three months ended January 31, 2013:

	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested shares at October 31, 2012		100		$	40.58
Granted		34		$	62.03
Vested		(42	)	$	36.61
Forfeited		(1	)	$	41.59
Nonvested shares at January 31, 2013		91		$	50.42

Summarized Activity Related to Director Deferred Compensation Shares

The following table summarizes activity related to director deferred compensation share equivalent units during the three months ended January 31, 2013:

	Number of Shares			Weighted-Average Grant Date Fair Value
Outstanding at October 31, 2012		200		$	19.44
Restricted stock units vested		7		$	43.32
Dividend equivalents		1		$	64.36
Distributions		(15	)	$	16.13
Outstanding at January 31, 2013		193		$	20.81