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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Operating activities:      
Net income $ 43,746 $ 39,813 $ 35,485
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,860 5,359 4,869
Impairment of definite-lived intangible assets    1,077   
Net (gains) losses on sales and disposals of property and equipment (39) 3 67
Deferred income tax (736) (1,004) 367
Excess tax benefits from settlements of stock-based equity awards (831) (850) (671)
Stock-based compensation 2,263 2,453 2,769
Unrealized foreign currency exchange (gains) losses, net (66) 1,113 2,112
Provision for bad debts 218 511 157
Changes in assets and liabilities:      
Trade accounts receivable (5,821) (3,800) 226
Inventories (2,237) (2,829) (12,347)
Other assets (2,209) (1,998) (64)
Accounts payable and accrued liabilities (560) (886) 3,206
Accrued payroll and related expenses (3,047) 10,362 (2,794)
Income taxes payable 2,001 2,284 1,412
Deferred and other long-term liabilities 188 (39) (545)
Net cash provided by operating activities 38,730 51,569 34,249
Investing activities:      
Purchases of property and equipment (4,085) (2,854) (3,765)
Proceeds from sales of property and equipment 331 158 1,167
Purchases of short-term investments (7,710) (38,838) (1,029)
Maturities of short-term investments 2,760 2,000 514
Purchases of intangible assets (1,799)    
Net cash used in investing activities (10,503) (39,534) (3,113)
Financing activities:      
Treasury stock purchases (42,773) (31,437) (39,840)
Dividends paid (20,184) (19,044) (18,228)
Proceeds from issuance of common stock 1,284 4,791 7,030
Excess tax benefits from settlements of stock-based equity awards 831 850 671
Proceeds from revolving credit facility 35,000 18,000 114,550
Repayments of revolving credit facility     (69,550)
Repayments of long-term debt     (10,715)
Net cash used in financing activities (25,842) (26,840) (16,082)
Effect of exchange rate changes on cash and cash equivalents 1,984 (1,480) (1,728)
Net increase (decrease) in cash and cash equivalents 4,369 (16,285) 13,326
Cash and cash equivalents at beginning of period 53,434 69,719 56,393
Cash and cash equivalents at end of period 57,803 53,434 69,719
Supplemental Cash Flow Information [Abstract]      
Interest 915 698 642
Income taxes, net of tax refunds received $ 18,147 $ 16,614 $ 13,240