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Notes Payable and Long-Term Debt - Footnote Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015 | Aug. 31, 2017 | Aug. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Receivables Securitization Facility, Amount |  |  | $ 700,000,000 |
Availability under Securitization Facility |  |  | 618,000,000 |
Long-term Debt, Fair Value |  |  | 2,100,000,000 |
Notes payable |  |  | 1,988,215,000 | $ 2,731,479,000
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  |  | 12,800,000 | 9,800,000
Debt Instrument, Term | 10 years |  |  |
Long-term Debt |  |  | $ 2,142,400,000 |
Unsecured debt | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 1.30% |
Unsecured debt | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 15.25% |
Five-year revolving facilities | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, amount outstanding |  |  | $ 480,000,000 | 700,000,000
Debt Instrument, Term |  |  | 5 years |
Five-year revolving facilities | Line of credit | Revolving credit facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.00% |
Five-year revolving facilities | Line of credit | Revolving credit facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.45% |
Three-Year Revolving Facility [Member] | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Term |  |  | 3 years |
Uncommitted lines of credit | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Line of Credit, Noncurrent |  |  | $ 433,900,000 |
Other international subsidiaries, lines of credit | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, amount outstanding |  |  | 168,400,000 |
Line Of Credit, Collateralized Amount |  |  | 15,400,000 |
Bilateral, uncommitted revolving facilities available to multiple subsidiaries [Member] | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term Debt, Fair Value |  |  | 100,000,000 |
Miscellaneous short-term notes payable | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, amount outstanding |  |  | $ 13,100,000 |
Term loans from cooperative and other banks | Line of credit | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 5.59% |
Long-term Debt |  |  | $ 15,000,000 | 45,000,000
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 6.18% |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |
Long-term Debt |  |  | $ 80,000,000 | 160,000,000
Private placement, payable in installments through 2018 | Unsecured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 5.60% |
Debt Instrument, Face Amount |  |  | $ 60,000,000 |
Long-term Debt |  |  | 4,615,000 | 13,846,000
Private placement, payable in equal installments beginning in 2014 through 2018 | Unsecured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | $ 10,000,000 | 20,000,000
Private placement, payable in equal installments beginning in 2014 through 2018 | Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 5.78% |
Debt Instrument, Face Amount |  |  | $ 50,000,000 |
Private placement, payable in equal installments beginning in 2017 through 2021 | Unsecured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | $ 80,000,000 | 100,000,000
Private placement, payable in equal installments beginning in 2017 through 2021 | Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 4.00% |
Debt Instrument, Face Amount |  |  | $ 100,000,000 |
Other notes and contracts | Secured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | 62,652,000 | 76,147,000
Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable |  |  | 1,695,423,000 | $ 1,803,174,000
Master participation agreements | Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term bank loans and notes payable current borrowing capacity |  |  | 94,100,000 |
Notes payable |  |  | $ 29,400,000 |
Master participation agreements | Notes Payable, Other Payables [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 2.61% |
Master participation agreements | Notes Payable, Other Payables [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 4.45% |
Recourse loan commitments | Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term bank loans and notes payable current borrowing capacity |  |  | $ 220,200,000 |
Short-term debt, maximum borrowing capacity |  |  | 265,000,000 |
Notes payable |  |  | $ 144,100,000 |
Interest rate |  |  | 2.45% |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable |  |  | $ 119,300,000 |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 0.10% |
Short-Term Notes Payable, Surplus Funds Program [Member] | Notes Payable, Other Payables [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 0.90% |
Committed Term Loans, September 2015 [Member] | Secured debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Term | 10 years | 10 years |  |
Debt Instrument, Face Amount | $ 600,000,000 |  | $ 600,000,000.0 |
Long-term Debt |  |  | 300,000,000 |
Amount re-advanced |  |  | $ 130,000,000 |
Committed Term Loans, September 2015 [Member] | Secured debt | London Interbank Offered Rate (LIBOR) [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.50% |
Committed Term Loans, September 2015 [Member] | Secured debt | London Interbank Offered Rate (LIBOR) [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |
Committed Term Loans, September 2015 [Member] | Secured debt | Base Rate [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |
Committed Term Loans, September 2015 [Member] | Secured debt | Base Rate [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |

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