Earnings Per Share and Dividends (Dividends) (Details 2) - USD ($)	9 Months Ended
May 31, 2017	May 31, 2016
Quarter One [Member]
Dividends Payable [Line Items]
Dividend Declaration Date	Oct. 20, 2016	Oct. 14, 2015
Dividend per Share	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 15,248,000	$ 15,906,000
Date of Record for Dividend Payment	Nov. 15, 2016	Nov. 16, 2015
Dividend Cash Payment Date	Dec. 01, 2016	Dec. 01, 2015
Quarter Two [Member]
Dividends Payable [Line Items]
Dividend Declaration Date	Jan. 26, 2017	Jan. 21, 2016
Dividend per Share	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 15,051,000	$ 15,947,000
Date of Record for Dividend Payment	Feb. 15, 2017	Feb. 16, 2016
Dividend Cash Payment Date	Mar. 01, 2017	Mar. 01, 2016
Quarter Three [Member]
Dividends Payable [Line Items]
Dividend Declaration Date	Apr. 20, 2017	Apr. 21, 2016
Dividend per Share	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 14,840,000	$ 15,940,000
Date of Record for Dividend Payment	May 15, 2017	May 16, 2016
Dividend Cash Payment Date	Jun. 01, 2017	Jun. 01, 2016

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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(24))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: 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(20))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: 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

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- Definition

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

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- Definition

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

+ References

No definition available.

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- Definition

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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No definition available.

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