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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Operating activities: |  |  |
Net earnings | $ 91,060 | $ 95,645 | $ 80,110
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization | 25,442 | 27,303 | 32,432
Non-cash portion of stock-based compensation expense | 9,980 | 9,495 | 8,154
Gain on sale of business, net | (4,666) | 0 | 0
Deferred income taxes | 33,656 | (8,618) | 2,085
Changes in operating assets and liabilities (net of effects of business acquisitions/divestitures): |  |  |
Accounts receivable | (16,612) | 766 | 8,159
Inventories | (7,563) | (5,687) | 4,833
Prepaid expenses and other assets | 1,747 | 1,812 | 475
Accounts payable and accrued liabilities | 13,091 | 22,255 | 3,928
Income taxes | (3,093) | 1,061 | (1,200)
Net cash provided by operating activities | 143,042 | 144,032 | 138,976
Investing activities: |  |  |
Purchases of property, plant and equipment | (21,777) | (15,167) | (17,140)
Sale of business, net of cash transferred with business | 19,141 | 0 | 0
Other | (269) | (86) | 1,724
Net cash used in investing activities | (2,905) | (15,253) | (15,416)
Financing activities: |  |  |
Payment of dividends | (42,873) | (41,880) | (40,808)
Proceeds from exercise of stock options | 12,099 | 19,728 | 5,246
Purchase of treasury stock | (1,462) | 0 | (23,552)
Proceeds from borrowings on line of credit | 23,221 | 180,320 | 96,276
Repayment of borrowing on line of credit | (78,419) | (244,268) | (91,759)
Principal payments on debt | 0 | (49,302) | (42,514)
Payments of Debt Issuance Costs | 0 | 0 | (803)
Income tax on equity-based compensation, and other | (3,246) | (839) | (1,662)
Net cash used in financing activities | (90,680) | (136,241) | (99,576)
Effect of exchange rate changes on cash and cash equivalents | (1,974) | 178 | 2,752
Net increase (decrease) in cash and cash equivalents | 47,483 | (7,284) | 26,736
Cash and cash equivalents, beginning of period | 133,944 | 141,228 | 114,492
Cash and cash equivalents, end of period | 181,427 | 133,944 | 141,228
Cash paid during the period for: |  |  |
Interest | 2,976 | 5,766 | 8,528
Income taxes | $ 33,267 | $ 31,885 | $ 28,497

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