Investments - Jefferies LoanCore - Narrative (Detail) - USD ($)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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May 31, 2016 |
May 31, 2015 |
May 31, 2016 |
May 31, 2015 |
Nov. 30, 2015 |
Mar. 31, 2016 |
Feb. 29, 2016 |
| Guarantee Obligations [Line Items] |
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| Equity commitment |
$ 600,000,000
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$ 600,000,000
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| Jefferies LoanCore, LLC [Member] |
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| Guarantee Obligations [Line Items] |
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| Aggregate commitment |
400,000,000
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|
400,000,000
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$ 600,000,000
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| Funded portion of equity commitment to subsidiary |
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78,300,000
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$ 207,400,000
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| Equity commitment |
$ 194,000,000
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$ 194,000,000
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291,000,000
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| Percentage of the Variable Interest Entity's (VIE) voting interest |
48.50%
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48.50%
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| Net earnings from equity method investment |
$ 17,300,000
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$ 16,500,000
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$ 22,700,000
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$ 36,500,000
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| Administrative services provided |
47,000
|
48,000
|
95,000
|
96,000
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| Receivables under service agreement |
$ 15,800
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$ 15,800
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$ 15,800
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| Placement fees earned |
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$ 200,000
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$ 600,000
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| Canada Pension Plan Investment Board [Member] | Jefferies LoanCore, LLC [Member] |
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| Guarantee Obligations [Line Items] |
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| Ownership percentage by third party |
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24.00%
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