Cash Dividends Declared to Common Stockholders (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Aug. 31, 2013 October 16, 2012	Aug. 31, 2013 January 23, 2013	Aug. 31, 2013 April 15, 2013	Aug. 31, 2013 July 18, 2013	Aug. 31, 2012 October 20, 2011	Aug. 31, 2012 January 25, 2012	Aug. 31, 2012 April 19, 2012	Aug. 31, 2012 July 19, 2012
Dividends [Line Items]
Dividend Declaration Date	Oct. 16, 2012	Jan. 23, 2013	Apr. 15, 2013	Jul. 18, 2013	Oct. 20, 2011	Jan. 25, 2012	Apr. 19, 2012	Jul. 19, 2012
Dividend per Share	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08
Total of Cash Dividends Declared	$ 16,962	$ 16,990	$ 16,994	$ 17,005	$ 17,379	$ 17,323	$ 17,281	$ 17,230
Date of Record for Dividend Payment	Nov. 15, 2012	Feb. 15, 2013	May 15, 2013	Aug. 15, 2013	Nov. 15, 2011	Feb. 16, 2012	May 15, 2012	Aug. 15, 2012
Dividend Cash Payment Date	Dec. 03, 2012	Mar. 01, 2013	Jun. 03, 2013	Sep. 03, 2013	Dec. 01, 2011	Mar. 01, 2012	Jun. 01, 2012	Sep. 04, 2012

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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=6367179&loc=d3e4304-108586

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

+ References

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

Reference 4: 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

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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.

+ References

No definition available.

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