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Acquisition and Dispositions - Sugarcane Land (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May. 01, 2015 USD ($) | Nov. 21, 2014 USD ($) a | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Apr. 03, 2015 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Cash payment for land |  |  |  |  |  | $ 1,509,000
Deferred gain on sale |  |  | $ 29,122,000 | $ 0 |  |
Net gain on sale |  |  | 16,517,000 | $ 4,821,000 | $ 20,299,000 |
Lease |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Deferred gain on sale |  |  | 17,300 |  |  |
Payments | $ 1,347,000 |  |  |  |  |
Interest expense |  |  | 607,000 |  |  |
Lease | Prepaid Expenses and Other Current Assets |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | $ 843,000 |  |  |
Global |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Land held for sale (in acres) | a |  | 36,000 |  |  |  |
Cash payment for land |  | $ 97,900,000 |  |  |  |
Net cash proceeds from the sugarcane land sale |  | 97,126,000 |  |  |  |
Post-closing adjustment period |  |  | 10 years |  |  |
Gain on sale |  | 42,753,000 |  |  |  |
Deferred gain on sale |  | $ 29,140,000 |  |  |  |
Global | Other Income (Expense) |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Net gain on sale |  |  | $ 13,613,000 |  |  |
Global | Lease |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Land held for sale (in acres) | a |  | 30,600 |  |  |  |

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