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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Operating activities:      
Net income $ 44,807 $ 43,746 $ 39,813
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 6,464 5,860 5,359
Impairment of long-lived assets 0 0 1,077
Net (gains) losses on sales and disposals of property and equipment (71) (39) 3
Deferred income taxes (1,334) (736) (1,004)
Excess tax benefits from settlements of stock-based equity awards (1,205) (831) (850)
Stock-based compensation 2,782 2,263 2,453
Unrealized foreign currency exchange losses (gains), net 2,086 (66) 1,113
Provision for bad debts 302 218 511
Changes in assets and liabilities:      
Trade accounts receivable (314) (5,821) (3,800)
Inventories 2,037 (2,237) (2,829)
Other assets 1,731 (2,209) (1,998)
Accounts payable and accrued liabilities (2,464) (560) (886)
Accrued payroll and related expenses (2,722) (3,047) 10,362
Income taxes payable 2,737 2,001 2,284
Other long-term liabilities 228 188 (39)
Net cash provided by operating activities 55,064 38,730 51,569
Investing activities:      
Purchases of property and equipment (5,784) (4,085) (2,854)
Proceeds from sales of property and equipment 333 331 $ 158
Purchase of intangible assets   $ (1,799)  
Acquisition of business (4,117)
Purchases of short-term investments (10,575) $ (7,710) $ (38,838)
Maturities of short-term investments 3,192 2,760 2,000
Net cash used in investing activities (16,951) (10,503) (39,534)
Financing activities:      
Treasury stock purchases (30,259) (42,773) (31,437)
Dividends paid (21,720) (20,184) (19,044)
Proceeds from issuance of common stock 2,111 1,284 4,791
Excess tax benefits from settlements of stock-based equity awards 1,205 831 850
Proceeds from revolving credit facility 10,000 35,000 18,000
Net cash used in financing activities (38,663) (25,842) (26,840)
Effect of exchange rate changes on cash and cash equivalents (3,357) 1,984 (1,480)
Net (decrease) increase in cash and cash equivalents (3,907) 4,369 (16,285)
Cash and cash equivalents at beginning of period 57,803 53,434 69,719
Cash and cash equivalents at end of period 53,896 57,803 53,434
Cash paid for:      
Interest 1,168 915 698
Income taxes, net of tax refunds received $ 15,414 $ 18,147 $ 16,614