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Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share
Net earnings	$ 52,465	$ 23,663	$ 42,446	$ 27,368	$ 46,120	$ 28,302	$ 38,751	$ 28,416	$ 145,942	$ 141,589	$ 132,235
Basic shares outstanding									68,392	68,880	68,797
Dilutive effect of stock options									1,210	1,427	1,343
Diluted shares outstanding									69,602	70,307	70,140
Basic earnings per share	$ 0.77	$ 0.35	$ 0.62	$ 0.40	$ 0.67	$ 0.41	$ 0.56	$ 0.41	$ 2.13	$ 2.06	$ 1.92
Diluted earnings per share	$ 0.76	$ 0.34	$ 0.61	$ 0.39	$ 0.66	$ 0.40	$ 0.55	$ 0.40	$ 2.10	$ 2.01	$ 1.89

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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