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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Jul. 31, 2017
IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Textual)
Allowance for doubtful accounts	$ 2,977	$ 2,550
Net asset value	13,900
IDT Financial Services Holding Limited [Member]
IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (Textual)
Outstanding equity interests	$ 3,800

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- References

No definition available.

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Amount classified as allowance for doubtful accounts attributable to disposal group held for sale or disposed of.

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Amount of net assets (liabilities).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606914-122999

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-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996

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-SubTopic 205
-Section 45
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-URI http://asc.fasb.org/extlink&oid=79984436&loc=d3e9915-115836

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
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-Name Accounting Standards Codification
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-Section S99
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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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