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COMMON STOCK EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  |  | 41,961,534 |
Balance as of beginning of period |  |  | $ 887,384 |
Net income | 172,971 | 45,469 | 180,664 | 105,675
Other comprehensive (loss) | 24 | 936 | (159) | 1,019
Common stock issued under stock plans |  |  | 9,701 |
Tax benefits from stock plans |  |  | 94 |
Cash dividend declared ($.84 per share) |  |  | (35,314) |
Treasury stock and other |  |  | (3,188) |
Balance as of end of period (shares) | 42,074,766 |  | 42,074,766 |
Balance as of end of period | 1,039,182 |  | 1,039,182 |
Cash dividend declared per share (usd per share) | $ 0.42 | $ 0.40 | $ 0.84 | $ 0.80
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  |  | 41,962,000 |
Balance as of beginning of period |  |  | 112,563 |
Common stock issued under stock plans (shares) |  |  | 224,000 |
Common stock issued under stock plans |  |  | 143 |
Treasury stock and other (shares) |  |  | (111,000) |
Balance as of end of period (shares) | 42,075,000 |  | 42,075,000 |
Balance as of end of period | 112,706 |  | 112,706 |
Premium on Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | 300,196 |
Common stock issued under stock plans |  |  | 2,817 |
Tax benefits from stock plans |  |  | 94 |
Balance as of end of period | 303,107 |  | 303,107 |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | (1,621) |
Other comprehensive (loss) |  |  | (159) |
Balance as of end of period | (1,780) |  | (1,780) |
Treasury Stock And Other [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | (128,638) |
Common stock issued under stock plans |  |  | 6,741 |
Treasury stock and other |  |  | (3,188) |
Balance as of end of period | (125,085) |  | (125,085) |
Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | 604,884 |
Net income |  |  | 180,664 |
Cash dividend declared ($.84 per share) |  |  | (35,314) |
Balance as of end of period | $ 750,234 |  | $ 750,234 |

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