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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Operating activities:      
Net income $ 70,229 $ 60,710 $ 55,908
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,019 7,701 7,593
Net gains on sales and disposals of property and equipment (249) (124) (99)
Deferred income taxes (1,334) (509) (4)
Stock-based compensation 9,555 5,358 4,446
Unrealized foreign currency exchange (gains) losses (511) 265 651
Provision for bad debts 210 134 67
Changes in assets and liabilities:      
Trade and other accounts receivable (6,595) (4,499) (7,318)
Inventories (13,774) 555 (4,800)
Other assets (5,343) 232 5,802
Operating lease assets and liabilities, net 15 233  
Accounts payable and accrued liabilities 15,485 2,725 (7,948)
Accrued payroll and related expenses 10,702 (1,042) 879
Other long-term liabilities and income taxes payable (695) 925 7,674
Net cash provided by operating activities 84,714 72,664 62,851
Investing activities:      
Purchases of property and equipment (15,059) (19,307) (13,282)
Proceeds from sales of property and equipment 599 362 383
Maturities of short-term investments     219
Net cash provided by (used in) investing activities (14,460) (18,945) (12,680)
Financing activities:      
Treasury stock purchases   (16,825) (29,625)
Dividends paid (38,225) (36,039) (32,889)
Proceeds from issuance of long-term senior notes 52,000    
Repayments of long-term senior notes (800) (800) (800)
Net proceeds (repayments) from revolving credit facility (50,056) 29,595 (2,912)
Shares withheld to cover taxes upon conversions of equity awards (3,668) (2,640) (2,783)
Net cash used in financing activities (40,749) (26,709) (69,009)
Effect of exchange rate changes on cash and cash equivalents (6) 2,219 (2,795)
Net increase (decrease) in cash and cash equivalents 29,499 29,229 (21,633)
Cash and cash equivalents at beginning of period 56,462 27,233 48,866
Cash and cash equivalents at end of period 85,961 56,462 27,233
Supplemental cash flow information:      
Accrued capital expenditures 1,123 1,764 1,848
Cash paid for:      
Interest 2,319 2,259 2,199
Income taxes, net of tax refunds received $ 19,254 $ 12,569 $ 16,879