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Subsequent Events (Details) - shares		9 Months Ended
	Jan. 02, 2020	Sep. 30, 2019	Oct. 29, 2019
Subsequent Event [Line Items]
Capital contribution period		5 years
Subsequent Event
Subsequent Event [Line Items]
Equity interest			20.00%
Private Placement | Forecast
Subsequent Event [Line Items]
Sale of stock, number of shares issued (in shares)	975,000

X

- Definition

Equity Method Investment, Capital Contribution Period

+ References

No definition available.

+ Details

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Namespace Prefix:	gdot_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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