Earnings Per Share and Dividends (Dividends) (Details 3) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
Feb. 29, 2016	Feb. 28, 2015
Quarter One [Member]
Dividends Payable [Line Items]
Dividend Declaration Date	Oct. 14, 2015	Oct. 16, 2014
Dividend per Share	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 15,906	$ 15,973
Date of Record for Dividend Payment	Nov. 16, 2015	Nov. 14, 2014
Dividend Cash Payment Date	Dec. 01, 2015	Dec. 01, 2014
Quarter Two [Member]
Dividends Payable [Line Items]
Dividend Declaration Date	Jan. 21, 2016	Jan. 21, 2015
Dividend per Share	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 15,947	$ 16,020
Date of Record for Dividend Payment	Feb. 16, 2016	Feb. 13, 2015
Dividend Cash Payment Date	Mar. 01, 2016	Mar. 02, 2015

Date the declared dividend will be paid, in CCYY-MM-DD format.

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=6367179&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Subparagraph a
-Article 7

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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