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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASC 740 ON THE UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period | $ 1,821,833 | $ 1,698,214 | $ 1,643,896 | $ 1,654,737 | $ 1,608,092 | $ 1,345,615 | $ 1,643,896 | $ 1,345,615
Net (loss) income | (111,831) | 149,809 | 81,045 | (19,298) | 73,846 | 75,752 | 119,023 | 130,300
Balance as of end of period | 1,682,066 | 1,821,833 | 1,698,214 | 1,612,478 | 1,654,737 | 1,608,092 | 1,682,066 | 1,612,478
Retained Earnings |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period | 1,114,382 | 996,580 | 947,501 | 959,722 | 915,764 | 869,858 | 947,501 | 869,858
Net (loss) income | (111,831) | 149,809 | 81,045 | (19,298) | 73,846 | 75,752 |  |
Balance as of end of period | $ 970,511 | $ 1,114,382 | 996,580 | 910,476 | 959,722 | 915,764 | 970,511 | 910,476
As Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | 1,844,692 | 1,889,107 | 1,827,803 | 1,551,717 | 1,844,692 | 1,551,717
Net (loss) income |  |  |  | (27,219) | 88,505 | 89,361 |  | 150,647
Balance as of end of period |  |  |  | 1,838,927 | 1,889,107 | 1,827,803 |  | 1,838,927
As Previously Reported | Retained Earnings |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  |  | 1,194,092 | 1,135,475 | 1,075,960 |  | 1,075,960
Net (loss) income |  |  |  | (27,219) | 88,505 | 89,361 |  |
Balance as of end of period |  |  |  | 1,136,925 | 1,194,092 | 1,135,475 |  | 1,136,925
Effect of Change |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | $ (200,796) | (234,370) | (219,711) | (206,102) | $ (200,796) | (206,102)
Net (loss) income |  |  |  | 7,921 | (14,659) | (13,609) |  | (20,347)
Balance as of end of period |  |  |  | (226,449) | (234,370) | (219,711) |  | (226,449)
Effect of Change | Retained Earnings |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  |  | (234,370) | (219,711) | (206,102) |  | (206,102)
Net (loss) income |  |  |  | 7,921 | (14,659) | (13,609) |  |
Balance as of end of period |  |  |  | $ (226,449) | $ (234,370) | $ (219,711) |  | $ (226,449)

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