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REDEEMABLE LIMITED PARTNERS' CAPITAL - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) notes_receivable limited_partner | Mar. 31, 2016 USD ($) | Jun. 30, 2016 | Oct. 31, 2014
Temporary Equity Disclosure [Abstract] |  |  |  |
Maximum exchange amount (as a percent) |  |  |  | 14.29%
Limited partners ownership (as a percent) | 64.00% |  | 68.00% |
Temporary Equity [Line Items] |  |  |  |
Total reductions to redeemable limited partners' capital | $ 0 |  |  |
Limited partner |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Decrease to fair value for the redemption amount | $ 296,566 |  |  |
Number of interest bearing notes receivable executed | notes_receivable | 0 |  |  |
Number of limited partners withdrawing from partnership | limited_partner | 1 |  |  |
Redeemable limited partners' capital | Limited partner |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Decrease to fair value for the redemption amount | $ 296,566 | $ 685,600 |  |
Total reductions to redeemable limited partners' capital | $ 247,100 |  |  |
Promissory note |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Promissory note for which common units are not eligible for exchange, term | 5 years |  |  |
Five-year, unsecured, non-interest bearing term promissory note | Promissory note |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Promissory note for which common units are not eligible for exchange, term | 5 years |  |  |

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