IDT Financial Services Ltd. Transactions (Details) $ in Thousands, € in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2016 shares	Jul. 31, 2016 USD ($)	Jul. 31, 2016 EUR (€)	Jul. 31, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Security deposit					$ 4,700
Cash acquired on acquisition date		$ 5,600	€ 5.0
Deferred payment receivable on acquisition date		500		€ 0.4
Gain on sale of interest in Visa Europe		$ 7,476
Conversion of Stock, Description		The shares of preferred stock become fully convertible in 2028. Beginning in 2020, Visa Inc. will assess whether it is appropriate to effect a partial conversion. The preferred stock shares may only be transferred to other former Visa Europe members, or to existing qualifying holders of Visa Inc.'s Class B common stock. In addition, the preferred stock will not be registered under the U.S. Securities Act of 1933 and therefore is not transferable unless such transfer is registered or an exemption from registration is available.	The shares of preferred stock become fully convertible in 2028. Beginning in 2020, Visa Inc. will assess whether it is appropriate to effect a partial conversion. The preferred stock shares may only be transferred to other former Visa Europe members, or to existing qualifying holders of Visa Inc.'s Class B common stock. In addition, the preferred stock will not be registered under the U.S. Securities Act of 1933 and therefore is not transferable unless such transfer is registered or an exemption from registration is available.
Deferred cash payment, Description		The deferred cash plus 4% compounded annual interest is due in June 2019	The deferred cash plus 4% compounded annual interest is due in June 2019
Series C Preferred Stock [Member] | Visa Europe [Member]
Preferred stock, shares issued | shares	1,830
Carrying value of Series C preferred stock		$ 1,600
Common Class A [Member] | Visa Europe [Member]
Conversion into stock | shares	25,532