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Defined Contribution Plans (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Defined Contribution Plan Disclosure [Line Items]
Maximum percentage of participants contribution	20.00%
Percentage of discretionary matching contributions	50.00%
Defined benefit plan compensation	6.00%
Company's cost for contributions to the plan	$ 1.3	$ 1.1	$ 1.1
401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Class B common stock to the Plan for matching contributions	70,843	72,281	51,861

X

- Definition

Defined Contribution Plan Employer Matching Contribution In Employer Shares.

+ References

No definition available.

+ Details

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- Definition

Defined contribution plan employer matching contribution limit percent.

+ References

No definition available.

+ Details

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Namespace Prefix:	idt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 70



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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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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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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