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REDEEMABLE LIMITED PARTNERS' CAPITAL - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 28, 2016 USD ($) | Aug. 25, 2016 USD ($) | Sep. 30, 2016 USD ($) notes_receivable limited_partner | Sep. 30, 2015 USD ($) | Jun. 30, 2016 | Oct. 31, 2014
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |
Maximum exchange percent |  |  |  |  |  | 14.29%
Temporary Equity [Line Items] |  |  |  |  |  |
Limited partners ownership (as a percent) |  |  | 66.00% |  | 68.00% |
Adjustment to redemption amount |  |  | $ (61,808) | $ (466,801) |  |
Reduction to redeemable limited partners' capital to reflect exchange of Class B common unites and associated shares of Class B common stock |  |  | (43,072) |  |  |
Limited Partner |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Adjustment to redemption amount |  |  | 61,808 |  |  |
Reduction to redeemable limited partners' capital to reflect exchange of Class B common unites and associated shares of Class B common stock |  |  | $ 43,072 |  |  |
Interest bearing notes receivable | notes_receivable |  |  | 0 |  |  |
Number of limited partners withdrawing from partnership | limited_partner |  |  | 0 |  |  |
Distributions to limited partners |  | $ 22,500 | $ 22,137 |  |  |
Limited Partner | Scenario, Forecast |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Distributions to limited partners | $ 22,100 |  |  |  |  |
Redeemable Limited Partners' Capital | Limited Partner |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Adjustment to redemption amount |  |  | 61,808 | $ 466,800 |  |
Reduction to redeemable limited partners' capital to reflect exchange of Class B common unites and associated shares of Class B common stock |  |  | 43,072 |  |  |
Distributions to limited partners |  |  | $ 22,137 |  |  |

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