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Earnings Per Common Share (Schedule Of Weighted Average Number Of Shares) (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Earnings Per Common Share [Abstract]
Weighted-average common shares outstanding, basic	14,636us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,202us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	14,652us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average dilutive securities	67us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	70us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	68us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	78us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average common shares outstanding, diluted	14,703us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	15,272us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	14,720us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	15,319us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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