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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Operating activities:    
Net income $ 11,758 $ 12,062
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,620 1,661
Net gains on sales and disposals of property and equipment (54) (3)
Deferred income taxes (405) 3
Excess tax benefits from settlements of stock-based equity awards (435) (1,390)
Stock-based compensation 1,622 633
Unrealized foreign currency exchange losses, net 1,075 360
Provision for bad debts (120) 78
Changes in assets and liabilities:    
Trade and other accounts receivable 6,357 430
Inventories (2,876) (3,730)
Other assets 1,070 1,688
Accounts payable and accrued liabilities 203 3,617
Accrued payroll and related expenses (8,886) (3,187)
Income taxes payable 2,619 2,403
Other long-term liabilities (45) 20
Net cash provided by operating activities 13,503 14,645
Investing activities:    
Purchases of property and equipment (11,603) (448)
Proceeds from sales of property and equipment 162  
Purchases of short-term investments (16,997) (2,933)
Maturities of short-term investments 4,548 2,846
Net cash used in investing activities (23,890) (535)
Financing activities:    
Treasury stock purchases (12,156) (8,075)
Dividends paid (5,998) (5,500)
Proceeds from issuance of common stock 197 421
Excess tax benefits from settlements of stock-based equity awards 435 1,390
Net proceeds from revolving credit facility 12,354 10,000
Net cash used in financing activities (5,168) (1,764)
Effect of exchange rate changes on cash and cash equivalents (1,854) (1,171)
Net (decrease) increase in cash and cash equivalents (17,409) 11,175
Cash and cash equivalents at beginning of period 50,891 53,896
Cash and cash equivalents at end of period $ 33,482 $ 65,071