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Receivables - Narrative (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) | Aug. 31, 2017 USD ($) | May 31, 2017 USD ($) a | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Aug. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) |  |  | $ 98,700 |  |  |
Valuation Allowances and Reserves, Additions for Charges to Other Accounts |  |  | $ 130,700 |  |  |
Notes Receivable, Long-Term |  |  |  |  |  |
CHS Capital long-term notes receivable |  | $ 17,000 |  | $ 17,000 | $ 322,400 |
Percentage of commercial notes to CHS Capital long-term notes receivable |  | 17.00% |  | 17.00% | 26.00% |
Percentage of producer notes to CHS Capital long-term notes receivable |  | 83.00% |  | 83.00% | 74.00% |
Interest income accrual, discontinue, term |  |  |  | 90 days |  |
Land received as collateral, area | a |  |  | 14,000 |  |  |
Debt Extinguished During Sale of Financial Assets | $ 554,000 |  |  | $ 554,000 | $ 0 | $ 0
Supplemental Deferred Purchase Price | $ 580,500 |  |  |  |  |
Maximum |  |  |  |  |  |
Notes Receivable, Short-Term |  |  |  |  |  |
CHS Capital short-term notes receivable, term |  |  |  | 12 months |  |
Notes and Loans Receivable, Net, Noncurrent, Term |  |  |  | 10 years |  |
CHS Capital [Member] |  |  |  |  |  |
Notes Receivable, Long-Term |  |  |  |  |  |
CHS Capital long-term notes receivable additional available credit of counterparty |  | $ 966,600 |  | $ 966,600 |  |
CHS Capital Notes Receivable [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Note receivables sold under loan participations |  | 71,500 |  |  |  |
Notes Receivable, Long-Term |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | $ 4,200 |  | $ 4,200 | $ 45,800 |
Customer Concentration Risk [Member] | CHS Capital Notes Receivable [Member] |  |  |  |  |  |
Notes Receivable, Long-Term |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 20.00% |
All other third party borrowers [Member] | Customer Concentration Risk [Member] | CHS Capital Notes Receivable [Member] |  |  |  |  |  |
Notes Receivable, Long-Term |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00% |  |

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