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Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2014

Dividends Declared and Paid

		Year Ended September 30,
		2014			2013			2012
Dividends declared and paid		$	21,263		$	21,866		$	21,351
Dividend per share amount			0.32			0.32			0.31

Stock-based Compensation Expense Recognized

		Year Ended September 30,
		2014			2013			2012
Employee stock-based compensation expense		$	11,241		$	9,414		$	8,628

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

	Year Ended September 30,
	2014						2013					2012
Expected term (years)		5.8	-	8.6			5.8	-	8.6			5.9	-	8.5
Estimated volatility		38.5%					48.7%	-	54.9%			48.9%	-	55.6%
Estimated dividend yield		0.8%					0.8%	-	1.0%			0.7%	-	1.1%
Risk-free interest rate		1.7%	-	2.5%			0.8%	-	1.3%			0.8%	-	1.6%

Weighted Average Grant Date Fair Value of Options Granted

		Year Ended September 30,
		2014			2013			2012
Weighted-average grant date fair value of options		$	15.63		$	15.84		$	12.14

Activity for Stock Option Awards

			Number			Weighted-Average Exercise Price
Balance at September 30, 2013				4,423		$	25.06
Options granted				694			40.99
Options exercised				(562)			19.67
Options forfeited				(54)			34.06
Balance at September 30, 2014				4,501			28.08

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			4,501		$	28.08			5.6		$	87,923
Options vested and exercisable			2,822			24.07			4.1			66,458
Options vested and expected to vest			4,419			27.92			5.5			87,066

Other Stock Option Information

		Year Ended September 30,
		2014			2013			2012
Total fair value of stock options vested		$	9,459		$	7,271		$	5,907
Total intrinsic value of options exercised			14,549			19,692			12,521
Cash received from exercises of stock options			9,772			8,272			6,180
Excess tax benefit realized from exercise of stock options			3,751			5,154			3,990

Stock Options [Member]

Changes in Nonvested Stock Options

		Number			Weighted-Average Exercise Price
Balance at September 30, 2013			1,737		$	29.97
Options granted			694			40.99
Options vested			(698)			28.97
Options forfeited			(54)			33.40
Balance at September 30, 2014			1,679			34.83

Restricted Stock Award [Member]

Changes in Restricted Stock Awards

		Number			Fair Value per Share
Balance at September 30, 2013			-		$	n/a
Shares granted			24			39.43
Shares vested			-			n/a
Shares forfeited			-			n/a
Balance at September 30, 2014			24			39.43

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