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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
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share
Net earnings	$ 43,784us-gaap_NetIncomeLoss	$ 23,383us-gaap_NetIncomeLoss
Basic shares outstanding	65,322us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	67,724us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock	1,417us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,297us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted shares outstanding	66,739us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	69,021us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted

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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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