Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands |
Nov. 30, 2021 |
Aug. 31, 2021 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Deferred compensation assets |
$ 51,113
|
$ 51,940
|
| Embedded derivative asset |
13,034
|
16,488
|
| Securities Segregated under Other Regulations |
96,447
|
99,837
|
| Other assets |
6,616
|
6,052
|
| Total assets |
628,062
|
738,452
|
| Foreign exchange derivatives |
|
8,506
|
| Total liabilities |
324,928
|
454,368
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Deferred compensation assets |
51,113
|
51,940
|
| Embedded derivative asset |
0
|
0
|
| Securities Segregated under Other Regulations |
96,447
|
99,837
|
| Other assets |
6,616
|
6,052
|
| Total assets |
157,017
|
160,282
|
| Foreign exchange derivatives |
|
0
|
| Total liabilities |
3,860
|
1,615
|
| Significant Other Observable Inputs (Level 2) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Deferred compensation assets |
0
|
0
|
| Embedded derivative asset |
13,034
|
16,488
|
| Securities Segregated under Other Regulations |
0
|
0
|
| Other assets |
0
|
0
|
| Total assets |
471,045
|
578,170
|
| Foreign exchange derivatives |
|
8,506
|
| Total liabilities |
321,068
|
452,753
|
| Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Deferred compensation assets |
0
|
0
|
| Embedded derivative asset |
0
|
0
|
| Securities Segregated under Other Regulations |
0
|
0
|
| Other assets |
0
|
0
|
| Total assets |
0
|
0
|
| Foreign exchange derivatives |
|
0
|
| Total liabilities |
0
|
0
|
| Commodity derivatives |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative Asset |
452,369
|
544,706
|
| Derivative Liability |
297,465
|
445,862
|
| Commodity derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative Asset |
2,841
|
2,453
|
| Derivative Liability |
3,860
|
1,615
|
| Commodity derivatives | Significant Other Observable Inputs (Level 2) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative Asset |
449,528
|
542,253
|
| Derivative Liability |
293,605
|
444,247
|
| Commodity derivatives | Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative Asset |
0
|
0
|
| Derivative Liability |
0
|
0
|
| Foreign exchange derivatives |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Foreign exchange derivatives |
8,483
|
19,429
|
| Foreign exchange derivatives |
27,463
|
|
| Foreign exchange derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Foreign exchange derivatives |
0
|
0
|
| Foreign exchange derivatives |
0
|
|
| Foreign exchange derivatives | Significant Other Observable Inputs (Level 2) |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Foreign exchange derivatives |
8,483
|
19,429
|
| Foreign exchange derivatives |
27,463
|
|
| Foreign exchange derivatives | Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Foreign exchange derivatives |
0
|
$ 0
|
| Foreign exchange derivatives |
$ 0
|
|