Stock-Based Compensation (Tables)

3 Months Ended

Dec. 31, 2016

Stock-Based Compensation

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

	Three Months Ended
	December 31,
	2016		2015
	(in thousands)
Compensation expense
Stock options	$	1,652	$	3,550
Restricted stock	4,249		4,371
	$	5,901	$	7,921

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

	2016		2015
Risk-free interest rate	2.0	%	1.8	%
Expected stock volatility	39.4	%	37.6	%
Dividend yield	3.4	%	4.6	%
Expected term (in years)	5.5		5.5

Summary of stock option activity under all existing long-term incentive plans

	Three Months Ended December 31, 2016
					Weighted-
			Weighted-		Average	Aggregate
			Average		Remaining	Intrinsic
	Shares		Exercise		Contractual Term	Value
Options	(in thousands)		Price		(in years)	(in millions)
Outstanding at October 1, 2016	3,312		$	51.74
Granted	324		81.31
Exercised	(335	)	39.40
Forfeited/Expired	(11	)	73.36
Outstanding at December 31, 2016	3,290		$	55.84	6.15	$	72.7
Vested and expected to vest at December 31, 2016	3,236		$	55.61	6.10	$	72.2
Exercisable at December 31, 2016	2,251		$	50.21	4.84	$	61.6

Summary of restricted stock awards and changes in restricted stock outstanding

	Three Months Ended
	December 31, 2016
			Weighted-
			Average
	Shares		Grant-Date
Restricted Stock Awards	(in thousands)		Fair Value
Unvested at October 1, 2016	648		$	64.24
Granted	263		81.31
Vested (1)	(270	)	63.79
Forfeited	(2	)	66.73
Unvested at December 31, 2016	639		$	71.46

(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.