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STOCKHOLDERS' EQUITY - Stock Purchase Obligation (Details) | 12 Months Ended |
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Sep. 30, 2017 shares / contract $ / shares | Jun. 30, 2014 $ / shares
Stock Purchase Obligation [Line Items] |  |
Stated value per Corporate Unit (in dollars per share) |  | $ 50,000,000
Equal to or greater than $57.8125 |  |
Stock Purchase Obligation [Line Items] |  |
Market value per share of common stock (in dollars per share) | $ 57.8125 |
Number of shares to be purchased per purchase contract | shares / contract | 0.8649 |
Less than $57.8125, but greater than $46.25 | Minimum |  |
Stock Purchase Obligation [Line Items] |  |
Market value per share of common stock (in dollars per share) | $ 46.25 |
Less than $57.8125, but greater than $46.25 | Maximum |  |
Stock Purchase Obligation [Line Items] |  |
Market value per share of common stock (in dollars per share) | 57.8125 |
Less than or equal to $46.25 |  |
Stock Purchase Obligation [Line Items] |  |
Market value per share of common stock (in dollars per share) | $ 46.25 |
Number of shares to be purchased per purchase contract | shares / contract | 1.0811 |

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