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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
May 31, 2018 | May 31, 2017
Operating activities: |  |
Net income | $ 43,578 | $ 38,562
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 5,849 | 5,005
Net gains on sales and disposals of property and equipment | (154) | (109)
Deferred income taxes | (7,025) | (101)
Stock-based compensation | 3,674 | 3,543
Unrealized foreign currency exchange (gains) losses, net | (200) | 872
Provision for bad debts | 48 | (141)
Changes in assets and liabilities: |  |
Trade accounts receivable | (6,285) | (1,915)
Inventories | (2,108) | (4,926)
Other assets | 3,137 | 1,660
Accounts payable and accrued liabilities | (1,630) | (125)
Accrued payroll and related expenses | (3,328) | (7,937)
Other long-term liabilities and income taxes payable | 6,030 | 456
Net cash provided by operating activities | 41,586 | 34,844
Investing activities: |  |
Purchases of property and equipment | (10,678) | (15,410)
Proceeds from sales of property and equipment | 345 | 403
Purchase of intangible assets | (175) |
Purchases of short-term investments | (84,540) | (26,815)
Maturities of short-term investments | 168,651 | 4,517
Net cash provided by (used in) investing activities | 73,603 | (37,305)
Financing activities: |  |
Treasury stock purchases | (17,784) | (26,227)
Dividends paid | (22,045) | (19,896)
Proceeds from issuance of common stock | 215 | 548
Proceeds from issuance of long-term senior notes | 20,000 |
Repayments of long-term senior notes | (400) |
Net (repayments) proceeds from revolving credit facility | (5,458) | 32,000
Shares withheld to cover taxes upon conversions of equity awards | (1,817) | (1,692)
Net cash used in financing activities | (27,289) | (15,267)
Effect of exchange rate changes on cash and cash equivalents | (1,644) | (958)
Net increase (decrease) in cash and cash equivalents | 86,256 | (18,686)
Cash and cash equivalents at beginning of period | 37,082 | 50,891
Cash and cash equivalents at end of period | $ 123,338 | $ 32,205

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X
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (Decrease) In Other Noncurrent Liabilities And Income Taxes Payable + References No definition available. + Details
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Namespace Prefix: | wdfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration