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Non-recurring charges - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	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

Schedule of non-recurring charges.

+ References

No definition available.

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Amount of noninterest expense classified as other.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
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- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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-Topic 420
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