Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2011

Dividends Declared and Paid

	Year Ending September 30,
	2011		2010		2009
Dividends declared and paid	$	18,581	$	17,085	$	16,864
Dividend per share amount		0.27		0.24		0.24

Stock-based Compensation Expense Recognized

	Year Ending September 30,
	2011		2010		2009
Employee stock-based compensation expense	$	6,590	$	6,686	$	5,499

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

	Year Ending September 30,
	2011	2010	2009
Expected term	5.8- 8.7 years	6.5years	7years
Estimated volatility	48% - 54%	51.0%	43.0%
Estimated dividend yield	1.0% - 1.3%	1.4%	1.4%
Risk-free interest rate	1.8% - 2.6%	3.4%	3.1%
Weighted-average forfeiture rate	0% - 7.8%	7.9%	8.2%

Weighted Average Grant Date Fair Value of Options Granted

	Year Ending September 30,
	2011		2010		2009
Weighted-average grant date fair value of options	$	15.00	$	11.04	$	7.73

Activity for Stock Option Awards

				Weighted-
				Average
	Number			Exercise Price
Balance at September 30, 2010		4,011		$	16.87
Options granted		709			32.10
Options exercised		(451	)		9.75
Options expired unexercised		(2	)		32.73
Options forfeited		(39	)		26.61
Balance at September 30, 2011		4,228			20.12

Stock Options Vested, Or Expected to Vest and Are Exercisable

					Weighted-
			Weighted-		Average		Aggregate
			Average		Remaining Life		Intrinsic
	Number		Exercise Price		in Years		Value
Options outstanding		4,228	$	20.12		5.5	$	36,390
Options expected to vest		1,302		27.70		8.3		3,065
Options exercisable		2,860		16.44		4.2		33,130

Other Stock Option Information

	Year Ending September 30,
	2011		2010		2009
Total fair value of stock options vested	$	5,587	$	3,786	$	4,344
Total intrinsic value of options exercised		10,145		14,083		8,695
Cash received from exercises of stock options		4,402		6,084		3,922
Excess tax benefit realized from exercise of stock options		3,558		5,115		2,695

Changes in Restricted Stock Awards

				Weighted-
				Average Grant
				Date Fair Value
	Number			per Share
Balance at September 30, 2010		70		$	33.49
Shares granted		—			n/a
Shares vested		(70	)		33.49
Shares forfeited		—			n/a
Balance at September 30, 2011		—			n/a

Stock Options [Member]

Changes in Nonvested Stock Options

				Weighted-
				Average
	Number			Exercise Price
Balance at September 30, 2010		1,256		$	23.37
Options granted		709			32.10
Options vested		(558	)		23.57
Options forfeited		(39	)		26.61
Balance at September 30, 2011		1,368			27.71