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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Operating activities:    
Net income $ 29,185 $ 27,448
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,825 3,886
Net gains on sales and disposals of property and equipment (15) (96)
Deferred income taxes 411 (7,184)
Stock-based compensation 3,358 3,238
Unrealized foreign currency exchange losses 460 284
Provision for bad debts 35 28
Changes in assets and liabilities:    
Trade accounts receivable (6,378) (7,147)
Inventories (7,189) (3,752)
Other assets 5,318 2,539
Accounts payable and accrued liabilities (5,239) (260)
Accrued payroll and related expenses (5,251) (4,329)
Other long-term liabilities and income taxes payable (1,294) 6,499
Net cash provided by operating activities 17,226 21,154
Investing activities:    
Purchases of property and equipment (5,006) (9,247)
Proceeds from sales of property and equipment 124 246
Purchase of intangible assets   (175)
Purchases of short-term investments   (84,181)
Maturities of short-term investments   83,967
Net cash used in investing activities (4,882) (9,390)
Financing activities:    
Treasury stock purchases (12,061) (11,377)
Dividends paid (16,011) (14,486)
Proceeds from issuance of common stock   215
Proceeds from issuance of long-term senior notes   20,000
Repayments of long-term senior notes (400)  
Net proceeds (repayments) of revolving credit facility 2,407 (6,780)
Shares withheld to cover taxes upon conversions of equity awards (2,433) (1,797)
Net cash used in financing activities (28,498) (14,225)
Effect of exchange rate changes on cash and cash equivalents (1,116) 1,879
Net decrease in cash and cash equivalents (17,270) (582)
Cash and cash equivalents at beginning of period 48,866 37,082
Cash and cash equivalents at end of period $ 31,596 $ 36,500