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Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 19, 2018 | Jun. 11, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017
Subsequent Events [Line Items] |  |  |  |  |  |
Cash dividend declared |  |  | $ 0.54 | $ 0.49 | $ 1.57 | $ 1.40
Dividend payable, declared date |  |  |  |  | Jun. 19, 2018 |
Dividends payable, date to be paid |  |  |  |  | Jul. 31, 2018 |
Dividend payable, record date |  |  |  |  | Jul. 20, 2018 |
Share-buy back plan, Date of agreement |  |  |  |  | Jun. 19, 2018 |
Repurchase period |  |  |  |  | September 1, 2018 through August 31, 2020 |
Subsequent Events [Member] |  |  |  |  |  |
Subsequent Events [Line Items] |  |  |  |  |  |
Cash dividend declared | $ 0.54 |  |  |  |  |
Subsequent Events [Member] | IQ Products Company Litigation Matter [Member] |  |  |  |  |  |
Subsequent Events [Line Items] |  |  |  |  |  |
Litigation settlement |  | $ 1.5 |  |  |  |
Chief Executive Officer And Chief Financial Officer [Member] | Subsequent Events [Member] |  |  |  |  |  |
Subsequent Events [Line Items] |  |  |  |  |  |
Share buy-back plan, amount authorized | $ 75.0 |  |  |  |  |

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- Definition Date the repurchase agreement was made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Footnote 2 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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