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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018
Statement of Cash Flows [Abstract] |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities | $ 4,506 | $ 4,525
Net income (Loss), Including Portion Attributable to Noncontrolling Interest | 218,180 | 114,083
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization, including debt cost | 23,704 | 21,978
Allowance for doubtful accounts | 382 | 128
Equity in losses (earnings) of unconsolidated affiliates | 855 | (184)
Stock-based compensation | 5,533 | 6,021
Gain on sale of property and equipment | (272) | (102)
Deferred income taxes | 4,839 | (888)
Changes in operating assets and liabilities: |  |
Accounts receivable | (25,408) | (29,270)
Vehicle pooling costs | (9,358) | (10,313)
Inventories | 1,710 | (3,268)
Prepaid expenses and other current and non-current assets | 4,079 | 614
Operating lease right-of-use assets and lease liabilities | 256 | 0
Accounts payable and accrued liabilities | 16,587 | (20,611)
Deferred revenue | (1,437) | 467
Income taxes receivable | (28,740) | 15,286
Income taxes payable | 1,700 | 14,177
Other liabilities | (152) | (435)
Net Cash Provided by (Used in) Operating Activities | 212,458 | 107,683
Cash flows from investing activities: |  |
Purchases of property and equipment | (131,793) | (62,336)
Proceeds from sale of property and equipment | 283 | 810
Net Cash Provided by (Used in) Investing Activities | (131,510) | (61,526)
Cash flows from financing activities: |  |
Proceeds from the exercise of stock options | 12,620 | 1,229
Payments for employee stock-based tax withholdings | 101,354 | 2
Net Cash Provided by (Used in) Financing Activities | (88,734) | 1,227
Effect of foreign currency translation | 2,569 | (1,595)
Net (decrease) increase in cash and cash equivalents | (5,217) | 45,789
Cash and cash equivalents at beginning of period | 186,319 | 274,520
Cash and cash equivalents at end of period | 181,102 | 320,309
Supplemental disclosure of cash flow information: |  |
Income taxes paid, net of refunds | $ 7,465 | $ 6,053

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