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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
May 31, 2016
May 31, 2015
Operating activities:    
Net income $ 38,396 $ 33,084
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,893 4,824
Net gains on sales and disposals of property and equipment (30) (82)
Deferred income taxes (601) (1,229)
Excess tax benefits from settlements of stock-based equity awards (1,618) (906)
Stock-based compensation 2,518 2,205
Unrealized foreign currency exchange losses, net 214 2,393
Provision for bad debts 15 214
Changes in assets and liabilities:    
Trade and other accounts receivable (7,229) (3,787)
Inventories (1,533) 1,078
Other assets 2,258 3,817
Accounts payable and accrued liabilities 2,963 (1,596)
Accrued payroll and related expenses 507 (5,003)
Income taxes payable 3,294 130
Other long-term liabilities 112 184
Net cash provided by operating activities 44,159 35,326
Investing activities:    
Purchases of property and equipment (3,311) (4,068)
Proceeds from sales of property and equipment 195 420
Acquisition of business   (3,705)
Purchases of short-term investments (22,920) (8,167)
Maturities of short-term investments 6,516 1,636
Net cash used in investing activities (19,520) (13,884)
Financing activities:    
Treasury stock purchases (24,691) (25,886)
Dividends paid (17,647) (16,177)
Proceeds from issuance of common stock 821 1,483
Excess tax benefits from settlements of stock-based equity awards 1,618 906
Net proceeds from revolving credit facility 10,000 10,000
Net cash used in financing activities (29,899) (29,674)
Effect of exchange rate changes on cash and cash equivalents (1,263) (2,654)
Net decrease in cash and cash equivalents (6,523) (10,886)
Cash and cash equivalents at beginning of period 53,896 57,803
Cash and cash equivalents at end of period $ 47,373 $ 46,917