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COMMON STOCK EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 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 | (14,274) | 29,155 | 166,390 | 134,830
Other comprehensive income | 834 | 287 | 675 | 1,306
Common stock issued under stock plans |  |  | 14,086 |
Tax benefits from stock plans |  |  | 348 |
Cash dividend declared ($1.26 per share) |  |  | (53,024) |
Treasury stock and other |  |  | (2,774) |
Balance as of end of period (shares) | 42,167,558 |  | 42,167,558 |
Balance as of end of period | 1,013,085 |  | 1,013,085 |
Cash dividend declared per share (usd per share) | $ 0.42 | $ 0.40 | $ 1.26 | $ 1.20
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) |  |  | 324,000 |
Common stock issued under stock plans |  |  | 214 |
Treasury stock and other (shares) |  |  | (118,000) |
Balance as of end of period (shares) | 42,168,000 |  | 42,168,000 |
Balance as of end of period | 112,777 |  | 112,777 |
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 |  |  | 4,187 |
Tax benefits from stock plans |  |  | 348 |
Balance as of end of period | 304,731 |  | 304,731 |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | (1,621) |
Other comprehensive income |  |  | 675 |
Balance as of end of period | (946) |  | (946) |
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 |  |  | 9,685 |
Treasury stock and other |  |  | (2,774) |
Balance as of end of period | (121,727) |  | (121,727) |
Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | 604,884 |
Net income |  |  | 166,390 |
Cash dividend declared ($1.26 per share) |  |  | (53,024) |
Balance as of end of period | $ 718,250 |  | $ 718,250 |

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