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Description Of Business And Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 USD ($) segment | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($)
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Accounts receivable, current | $ 80,610 | $ 74,063 |
Allowance for doubtful accounts | $ 8,300 | 9,700 |
Number of reportable segments | segment | 2 |  |
Impairments | $ 0 | $ 0 | $ 0
Leased Barriers [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 12 years |  |
Maximum [Member] | Leased Barrier Transfer Machines [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 10 years |  |
Maximum [Member] | Building [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 30 years |  |
Maximum [Member] | Equipment [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 7 years |  |
Maximum [Member] | Other [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 20 years |  |
Minimum [Member] | Leased Barrier Transfer Machines [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 8 years |  |
Minimum [Member] | Building [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 15 years |  |
Minimum [Member] | Equipment [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 3 years |  |
Minimum [Member] | Other [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Useful life | 2 years |  |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51659069&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 + Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 + Details
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