Stock-Based Compensation (Tables)

6 Months Ended

12 Months Ended

Mar. 31, 2015

Sep. 30, 2014

STOCK-BASED COMPENSATION

Summary of compensation cost for stock-based payment arrangements recognized in general and administrative expense

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2015		2014		2015		2014
	(in thousands)				(in thousands)
Compensation expense
Stock options	$	1,908	$	1,989	$	4,970	$	5,642
Restricted stock	4,189		3,805		8,109		7,162
	$	6,097	$	5,794	$	13,079	$	12,804

	September 30,
	2014		2013		2012
	(in thousands)
Compensation expense
Stock options	$	11,268	$	11,512	$	9,791
Restricted stock		15,435		11,759		8,287
	$	26,703	$	23,271	$	18,078

Summary of weighted-average assumptions utilized in determining the fair value of options granted

	2015		2014
Risk-free interest rate	1.7	%	1.6	%
Expected stock volatility	36.9	%	52.6	%
Dividend yield	3.9	%	3.1	%
Expected term (in years)	5.5		5.5

	2014			2013			2012
Risk-free interest rate		1.6	%		0.7	%		1.0	%
Expected stock volatility		52.6	%		53.9	%		53.3	%
Dividend yield		3.1	%		1.1	%		0.4	%
Expected term (in years)		5.5			5.5			5.5

Summary of stock option activity

	Three Months Ended March 31, 2015
					Weighted-
			Weighted-		Average	Aggregate
			Average		Remaining	Intrinsic
	Shares		Exercise		Contractual Term	Value
Options	(in thousands)		Price		(in years)	(in millions)
Outstanding at January 1, 2015	2,931		$	47.96
Granted	—		—
Exercised	(20	)	51.38
Forfeited/Expired	(2	)	76.68
Outstanding at March 31, 2015	2,909		$	47.91	5.6	$	61.8
Vested and expected to vest at March 31, 2015	2,902		$	47.86	5.6	$	61.8
Exercisable at March 31, 2015	2,147		$	41.22	4.6	$	58.7

	Six Months Ended March 31, 2015
			Weighted-
			Average
	Shares		Exercise
Options	(in thousands)		Price
Outstanding at October 1, 2014	2,629		$	43.46
Granted	420		68.83
Exercised	(124	)	21.56
Forfeited/Expired	(16	)	68.59
Outstanding at March 31, 2015	2,909		$	47.91

        The following summary reflects the stock option activity for our common stock and related information for fiscal 2014, 2013 and 2012 (shares in thousands):

	2014					2013					2012
	Options			Weighted-Average Exercise Price		Options			Weighted-Average Exercise Price		Options			Weighted-Average Exercise Price
Outstanding at October 1,		3,991		$	34.12		4,690		$	29.56		4,589		$	25.84
Granted		261			79.67		365			54.18		456			59.68
Exercised		(1,613	)		26.08		(1,057	)		20.68		(314	)		17.24
Forfeited/Expired		(10	)		68.82		(7	)		52.32		(41	)		42.21
Outstanding on September 30,		2,629		$	43.46		3,991		$	34.12		4,690		$	29.56
Exercisable on September 30,		1,884		$	35.93		3,063		$	28.48		3,575		$	24.66
Shares available to grant		3,432					4,116					5,082

Summary of restricted stock awards and changes in restricted stock outstanding

	Six Months Ended
	March 31, 2015
			Weighted-
			Average
	Shares		Grant-Date
Restricted Stock Awards	(in thousands)		Fair Value
Unvested at October 1, 2014	634		$	64.03
Granted	275		68.83
Vested (1)	(214	)	54.18
Forfeited	(8	)	66.51
Unvested at March 31, 2015	687		$	66.93

(1) The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

        A summary of the status of our restricted stock awards as of September 30, 2014, and of changes in restricted stock outstanding during the fiscal years ended September 30, 2014, 2013 and 2012, is as follows (shares in thousands):

	2014					2013					2012
	Shares			Weighted-Average Grant Date Fair Value per Share		Shares			Weighted-Average Grant Date Fair Value per Share		Shares			Weighted-Average Grant Date Fair Value per Share
Outstanding at October 1,		576		$	55.17		430		$	52.52		323		$	42.38
Granted		230			79.67		307			54.18		244			59.76
Vested (1)		(157	)		54.08		(155	)		45.88		(119	)		40.21
Forfeited/Expired		(15	)		67.92		(6	)		54.67		(18	)		49.75
Outstanding on September 30,		634		$	64.03		576		$	55.17		430		$	52.52

(1) The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.