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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Operating activities:    
Net income $ 13,279 $ 12,630
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,925 1,917
Net gains on sales and disposals of property and equipment (3) (45)
Deferred income taxes 569 261
Stock-based compensation 1,965 1,777
Unrealized foreign currency exchange losses 210 150
Provision for bad debts 10 (21)
Changes in assets and liabilities:    
Trade accounts receivable (2,302) 217
Inventories (2,851) (1,459)
Other assets 8,037 3,219
Accounts payable and accrued liabilities (8,089) (3,994)
Accrued payroll and related expenses (3,310) (1,500)
Other long-term liabilities and income taxes payable (431) (573)
Net cash provided by operating activities 9,009 12,579
Investing activities:    
Purchases of property and equipment (1,292) (1,009)
Proceeds from sales of property and equipment 58 116
Purchase of intangible assets   (175)
Purchases of short-term investments   (103)
Net cash used in investing activities (1,234) (1,171)
Financing activities:    
Treasury stock purchases (6,863) (3,893)
Dividends paid (7,522) (6,888)
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 repayments of revolving credit facility (6,938) (10,000)
Shares withheld to cover taxes upon conversions of equity awards (2,425) (1,763)
Net cash used in financing activities (24,148) (2,329)
Effect of exchange rate changes on cash and cash equivalents (919) 771
Net (decrease) increase in cash and cash equivalents (17,292) 9,850
Cash and cash equivalents at beginning of period 48,866 37,082
Cash and cash equivalents at end of period $ 31,574 $ 46,932