Stock-Based Employee Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2013

AssumptionsUsed 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 2013, 2012 and 2011:

	Year Ended September 30,
	2013			2012			2011
Stock Options:
Average expected term (years)		4.10			4.31			4.27
Expected volatility (range)		35-37	%		38-41	%		39-41	%
Weighted average volatility		37	%		40	%		40	%
Risk-free interest rate (range)		0.5-1.1	%		0.5-1.5	%		0.6-2.1	%
Average expected dividend yield		0.2	%		0.3	%		0.3	%
Expected dividend yield (range)		0.2	%		0.2-0.3	%		0.3	%

Summary of Option Activity

The following table summarizes option activity during fiscal 2013:

	Shares			Weighted- average Exercise Price		Weighted- average Remaining Contractual Term		Aggregate Intrinsic Value
	(In thousands)					(In years)		(In thousands)
Outstanding at October 1, 2012		4,034		$	33.01
Granted		757			42.86
Exercised		(1,360	)		31.79
Forfeited		(334	)		26.03
Expired		(410	)		44.73
Outstanding at September 30, 2013		2,687		$	35.48		4.86	$	53,203
Options exercisable at September 30, 2013		942		$	32.57		3.57	$	21,388
Vested and expected to vest at September 30, 2013		2,435		$	35.03		4.78	$	49,312

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity during fiscal 2013:

	Shares			Weighted- average Price
	(In thousands)
Outstanding at October 1, 2012		1,732		$	33.31
Granted		782			42.59
Released		(603	)		30.08
Forfeited		(195	)		34.57
Outstanding at September 30, 2013		1,716			38.54