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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
May 31, 2012
May 31, 2011
Operating activities:    
Net income $ 26,512 $ 26,247
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,691 3,130
Net losses on sales and disposals of property and equipment 4 147
Deferred income taxes 664 466
Excess tax benefits from settlements of stock-based equity awards (449) (924)
Stock-based compensation 2,169 2,671
Unrealized foreign currency exchange losses, net 1,128 218
Provision for bad debts 83 108
Changes in assets and liabilities:    
Trade accounts receivable 2,381 (3,822)
Inventories (8,451) (5,627)
Other assets (1,293) 3,289
Accounts payable and accrued liabilities 2,195 3,509
Accrued payroll and related expenses (2,960) (9,577)
Income taxes payable 1,263 1,635
Deferred and other long-term liabilities (536) 103
Net cash provided by operating activities 26,401 21,573
Investing activities:    
Purchases of property and equipment (3,043) (2,004)
Proceeds from sales of property and equipment 1,133 127
Purchases of short-term investments (529) 0
Maturities of short-term investments 514 0
Net cash used in investing activities (1,925) (1,877)
Financing activities:    
Repayments of long-term debt (10,715) (10,714)
Proceeds from revolving credit facility 99,550 0
Repayments of revolving credit facility (54,550) 0
Dividends paid (13,625) (13,748)
Proceeds from issuance of common stock 3,112 16,518
Treasury stock purchases (30,901) (21,302)
Excess tax benefits from settlements of stock-based equity awards 449 924
Net cash used in financing activities (6,680) (28,322)
Effect of exchange rate changes on cash and cash equivalents (2,480) 2,979
Net increase (decrease) in cash and cash equivalents 15,316 (5,647)
Cash and cash equivalents at beginning of period 56,393 75,928
Cash and cash equivalents at end of period $ 71,709 $ 70,281