EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income, as reported	$ 34,929	$ 50,282
Basic earnings per share
Weighted average shares of common stock outstanding-basic (shares)	86,084,000	85,675,000
Basic earnings per common share (usd per share)	$ 0.41	$ 0.59
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (shares)	86,084,000	85,675,000
Incremental shares	771,000	1,001,000
Weighted average shares of common stock outstanding-diluted (shares)	86,855,000	86,676,000
Diluted (loss) earnings per common share (usd per share)	$ 0.40	$ 0.58
Anti-dilutive shares excluded from the calculation of diluted earnings per share	0	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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