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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
May 31, 2013
May 31, 2012
Operating activities:    
Net income $ 31,672 $ 26,512
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,765 3,691
Net (gains) losses on sales and disposals of property and equipment (12) 4
Deferred income taxes 451 664
Excess tax benefits from settlements of stock-based equity awards (666) (449)
Stock-based compensation 1,859 2,169
Unrealized foreign currency exchange losses, net 1,326 1,128
Provision for bad debts 399 83
Changes in assets and liabilities:    
Trade accounts receivable (4,395) 2,381
Inventories (4,421) (8,451)
Other assets 144 (1,293)
Accounts payable and accrued liabilities 276 2,195
Accrued payroll and related expenses 4,138 (2,960)
Income taxes payable 1,495 1,263
Deferred and other long-term liabilities 127 (536)
Net cash provided by operating activities 36,158 26,401
Investing activities:    
Purchases of property and equipment (1,975) (3,043)
Proceeds from sales of property and equipment 112 1,133
Purchases of short-term investments (36,424) (529)
Maturities of short-term investments 1,029 514
Net cash used in investing activities (37,258) (1,925)
Financing activities:    
Repayments of long-term debt   (10,715)
Proceeds from revolving credit facility 18,000 99,550
Repayments of revolving credit facility   (54,550)
Dividends paid (14,263) (13,625)
Proceeds from issuance of common stock 3,213 3,112
Treasury stock purchases (22,294) (30,901)
Excess tax benefits from settlements of stock-based equity awards 666 449
Net cash used in financing activities (14,678) (6,680)
Effect of exchange rate changes on cash and cash equivalents (1,668) (2,480)
Net (decrease) increase in cash and cash equivalents (17,446) 15,316
Cash and cash equivalents at beginning of period 69,719 56,393
Cash and cash equivalents at end of period $ 52,273 $ 71,709