Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Operating activities
Net income	$ 84,234us-gaap_ProfitLoss	$ 12,622us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,462us-gaap_DepreciationAndAmortization	12,108us-gaap_DepreciationAndAmortization
Deferred income taxes	2,176	6,609
Provision for doubtful accounts receivable	90us-gaap_ProvisionForDoubtfulAccounts	1,367us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of interest in Fabrix Systems Ltd.	(76,864)
Gain on proceeds from insurance		(571)idt_GainOnInsuranceSettlement
Interest in the equity of investments	(1,655)	(1,433)
Stock-based compensation	4,012us-gaap_ShareBasedCompensation	4,920us-gaap_ShareBasedCompensation
Change in assets and liabilities:
Restricted cash and cash equivalents	(11,400)	(14,278)
Trade accounts receivable	8,544	1,292
Prepaid expenses, other current assets and other assets	2,604	(1,658)
Trade accounts payable, accrued expenses, other current liabilities and other liabilities	(5,287)	(14,438)
Customer deposits	11,169	16,103
Income taxes payable	(278)	(42)
Deferred revenue	(3,024)	7,035
Net cash provided by operating activities	27,783	29,636
Investing activities
Capital expenditures	(22,810)	(12,431)
Proceeds from sale of interest in Fabrix Systems Ltd, net of cash and cash equivalents sold.	36,455
Purchase of investments	(125)us-gaap_PaymentsToAcquireInvestments	(425)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale and redemption of investments	71	1,038
Proceeds from insurance		571
Purchases of marketable securities	(35,502)	(15,690)
Proceeds from maturities and sales of marketable securities	16,840	12,957
Net cash used in investing activities	(5,071)	(13,980)
Financing activities
Dividends paid	(43,171)us-gaap_PaymentsOfDividendsCommonStock	(9,687)us-gaap_PaymentsOfDividendsCommonStock
Distributions to noncontrolling interests	(1,450)us-gaap_PaymentsOfCapitalDistribution	(1,287)us-gaap_PaymentsOfCapitalDistribution
Purchases of stock of subsidiary		(1,133)idt_PurchasesOfStockOfSubsidiary
Proceeds from exercise of stock options	3,317	609
Proceeds from revolving credit loan payable		43,000us-gaap_ProceedsFromLinesOfCredit
Repayments of revolving credit loan payable and other borrowings	(13,201)us-gaap_RepaymentsOfLongTermDebt	(51,252)us-gaap_RepaymentsOfLongTermDebt
Repurchases of Class B common stock	(703)	(955)
Net cash used in financing activities	(55,208)	(20,705)
Effect of exchange rate changes on cash and cash equivalents	(6,573)	476
Net decrease in cash and cash equivalents	(39,069)	(4,573)
Cash and cash equivalents at beginning of period	153,823	151,600
Cash and cash equivalents at end of period	114,754	147,027
Supplemental schedule of non-cash investing and financing activities
Net liabilities excluding cash and cash equivalents of Fabrix Systems Ltd. sold	14,333
Adjustment to liabilities in connection with the Straight Path Spin-Off		$ 1,624

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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