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Debt - Schedule of Net Carrying Amount of Equity Component of the Notes (Details) - Convertible debt - Convertible Senior Notes $ in Thousands	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Conversion option	$ 63,756
Issuance costs	(1,998)
Net carrying amount	$ 61,758

X

- Definition

Debt Instrument, Conversion Option, Equity Component

+ References

No definition available.

+ Details

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Namespace Prefix:	fivn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Instrument, Issuance Costs, Equity Component

+ References

No definition available.

+ Details

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Namespace Prefix:	fivn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

+ Details

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Period Type:	instant

X

- 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.

+ Details

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: