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Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2016

Dividends Declared and Paid



		Year Ended September 30,
		2016			2015			2014
Dividends declared and paid		$	26,606		$	24,646		$	21,263
Dividend per share amount			0.43			0.38			0.32



Stock-based Compensation Expense Recognized



		Year Ended September 30,
		2016			2015			2014
Employee stock-based compensation expense		$	15,122		$	14,255		$	11,241



Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards



	Year Ended September 30,
	2016						2015					2014
Expected term (years)		6.3	-	8.7			6.2	-	8.8			5.8	-	8.6
Estimated volatility		34.5%	-	35.1%			36.5%					38.5%
Estimated dividend yield		1.0%					0.7%					0.8%
Risk-free interest rate		1.7%	-	2.0%			2.0%	-	2.3%			1.7%	-	2.5%



Weighted Average Grant Date Fair Value of Options Granted



		Year Ended September 30,
		2016				2015			2014
Weighted-average grant date fair value of options		$		13.39		$	17.02		$	15.63



Activity for Stock Option Awards



		Number			Weighted-Average Exercise Price
Balance at September 30, 2015			4,641		$	32.28
Options granted			1,055			40.26
Options exercised			(732)			22.74
Options forfeited			(20)			42.75
Balance at September 30, 2016			4,944			35.35



Changes in Nonvested Stock Options



		Number			Weighted-Average Grant Date Fair Value
Balance at September 30, 2015			1,724		$	15.92
Options granted			1,055			13.39
Options vested			(684)			15.15
Options forfeited			(20)			15.08
Balance at September 30, 2016			2,075			14.90



Other Stock Option Information



		Year Ended September 30,
		2016			2015			2014
Total fair value of stock options vested		$	10,374		$	9,656		$	9,459
Total intrinsic value of options exercised			23,178			18,876			14,549
Cash received from exercises of stock options			15,892			8,400			9,772
Excess tax benefit realized from exercise of stock options			6,472			6,959			3,751



Changes in Restricted Stock Awards



		Number			Fair Value per Share
Balance at September 30, 2015			24		$	39.43
Shares granted			-			n/a
Shares vested			-			n/a
Shares forfeited			-			n/a
Balance at September 30, 2016			24			39.43



Stock Options [Member]

Stock Options Vested, Or Expected to Vest and Are Exercisable



		Number			Weighted- Average Exercise Price			Weighted- Average Remaining Life in Years			Aggregate Intrinsic Value
Options outstanding			4,944		$	35.35			6.1		$	134,129
Options vested and exercisable			2,869			30.87			4.6			90,702
Options vested and expected to vest			4,856			35.23			6.0			132,321



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