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Non-recurring charges - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
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Nov. 30, 2018 | Sep. 30, 2018
Schedule of Non-recurring Charges [Line Items] |  |
Non-recurring charges |  | $ 85,057
Employee Severance [Member] |  |
Schedule of Non-recurring Charges [Line Items] |  |
Restructuring charge |  | 30,057
Long Running Legal Dispute [Member] |  |
Schedule of Non-recurring Charges [Line Items] |  |
Non-recurring charges |  | $ 55,000
Long Running Legal Dispute [Member] | Subsequent Event [Member] |  |
Schedule of Non-recurring Charges [Line Items] |  |
Settlement payments | $ 50,000 |

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- Definition Amount of noninterest expense classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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