Stock-Based Employee Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2012

Assumptions Used to Estimate Fair Value of Stock Options

We estimate the fair value of stock options granted using the Black-Scholes option valuation model and we amortize the fair value on a straight-line basis over the vesting period. We used the following assumptions to estimate the fair value of our stock options during fiscal 2012, 2011 and 2010:

	2012			2011			2010
Stock Options:
Average expected term (years)		4.31			4.27			4.22
Expected volatility (range)		38-41	%		39-41	%		35-42	%
Weighted average volatility		40	%		40	%		41	%
Risk-free interest rate (range)		0.5-1.5	%		0.6-2.1	%		0.2-3.1	%
Average expected dividend yield		0.3	%		0.3	%		0.4	%
Expected dividend yield (range)		0.2-0.3	%		0.3	%		0.4-0.5	%

Summary of Option Activity

The following table summarizes option activity during fiscal 2012:

	Shares			Weighted- average Exercise Price		Weighted- average Remaining Contractual Term		Aggregate Intrinsic Value
	(In thousands)					(In years)		(In thousands)
Outstanding at October 1, 2011		5,812		$	29.94
Granted		978			38.45
Exercised		(2,553	)		28.25
Forfeited		(121	)		25.02
Expired		(82	)		39.75
Outstanding at September 30, 2012		4,034		$	33.01		3.84	$	45,828
Options exercisable at September 30, 2012		1,994		$	36.30		1.95	$	16,341
Vested and expected to vest at September 30, 2012		3,590		$	33.43		3.66	$	39,347

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity during fiscal 2012:

	Shares			Weighted- average Price
	(In thousands)
Outstanding at October 1, 2011		1,105		$	23.14
Granted		1,207			38.30
Released		(408	)		23.01
Forfeited		(172	)		27.37
Outstanding at September 30, 2012		1,732			33.31