Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Operating activities
Net income (loss)	$ 58,018	$ (133)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	13,381	15,718
Deferred income taxes	(13,811)	2,912
Provision for doubtful accounts receivable	1,220	2,282
Stock-based compensation	1,215	3,341
(Gain) loss on investments	(4,923)	814
Change in assets and liabilities:
Trade accounts receivable	1,626	8,374
Prepaid expenses, other current assets, and other assets	(7,961)	(13,080)
Trade accounts payable, accrued expenses, other current liabilities, and other liabilities	(2,154)	(18,894)
Customer deposits at IDT Financial Services Limited (Gibraltar-based bank)	(11,078)	(67,273)
Deferred revenue	2,611	(4,704)
Net cash provided by (used in) operating activities	38,144	(70,643)
Investing activities
Capital expenditures	(13,455)	(11,861)
Payments for acquisitions, net of cash acquired	(2,656)	(450)
Purchase of Rafael Holdings, Inc. Class B common stock and warrant	(5,000)
Exercise of warrant to purchase shares of Rafael Holdings, Inc. Class B common stock	(1,000)
Purchase of series B convertible preferred stock in equity method investment	(4,000)
Purchases of debt securities and equity investments	(39,347)	(14,790)
Proceeds from maturities and sales of debt securities and redemptions of equity investments	18,670	4,317
Net cash used in investing activities	(46,788)	(22,784)
Financing activities
Distributions to noncontrolling interests	(646)	(680)
Repayment of other liabilities.	(69)	(449)
Proceeds from note payable		10,000
Repayment of note payable		(10,000)
Repayments of borrowings under revolving credit facility		(1,429)
Proceeds from borrowings under revolving credit facility		1,429
Proceeds from exercise of stock options	686	276
Repurchases of Class B common stock	(4,192)	(478)
Net cash used in financing activities	(4,221)	(1,331)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash and cash equivalents	6,652	4,012
Net decrease in cash, cash equivalents, and restricted cash and cash equivalents	(6,213)	(90,746)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period	201,222	257,199
Cash, cash equivalents, and restricted cash and cash equivalents at end of period	195,009	166,453
Supplemental schedule of non-cash investing and financing activities
Liabilities incurred for acquisition	$ 393	$ 375