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Derivative Instruments (Details)	12 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 31, 2017 NOK
August 2017 [Member]
Derivative [Line Items]
Settlement date	Aug. 31, 2017	Aug. 31, 2017
Amount	$ 1,000,000	NOK 8,408,640
September 2017 [Member]
Derivative [Line Items]
Settlement date	Sep. 30, 2017	Sep. 30, 2017
Amount	$ 1,000,000	NOK 8,404,640

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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Period Type:	duration

X

- Definition

Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of underlying refers to the price on the security, commodity, index, or other variable specified by the contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	zdge_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type: