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Derivative instruments - Call Spread (Details) - Subsidiaries - Call spread - Cash Flow Hedging $ in Thousands	Apr. 30, 2017 USD ($) $ / option
Derivatives designated as hedging instruments | Citibank S.A.
Derivative [Line Items]
Nominal Amount | $	$ 50,000
Derivatives designated as hedging instruments | Citibank S.A. | Written
Derivative [Line Items]
Strike price (in usd per option)	4.49
Derivatives designated as hedging instruments | Citibank S.A. | Bought
Derivative [Line Items]
Strike price (in usd per option)	3.11
Derivatives designated as hedging instruments | JP Morgan S.A.
Derivative [Line Items]
Nominal Amount | $	$ 50,000
Derivatives designated as hedging instruments | JP Morgan S.A. | Written
Derivative [Line Items]
Strike price (in usd per option)	5.20
Derivatives designated as hedging instruments | JP Morgan S.A. | Bought
Derivative [Line Items]
Strike price (in usd per option)	3.13
Derivatives not designated as hedging instruments | JP Morgan S.A.
Derivative [Line Items]
Nominal Amount | $	$ 30,000
Derivatives not designated as hedging instruments | JP Morgan S.A. | Written
Derivative [Line Items]
Strike price (in usd per option)	5.62
Derivatives not designated as hedging instruments | JP Morgan S.A. | Bought
Derivative [Line Items]
Strike price (in usd per option)	8.20

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The strike price on the price risk option contract such as a put option or a call option.

+ References

No definition available.

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