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Share Repurchase Plans (Details) - USD ($) $ in Thousands	12 Months Ended			18 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2016	Sep. 01, 2016	May 31, 2015
Equity, Class of Treasury Stock [Line Items]
Total cost of repurchased shares	$ 32,131	$ 30,259	$ 42,773
2013 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized						$ 60,000
2014 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized	$ 75,000			$ 75,000
Share buy-back plan, number of shares repurchased				503,127
Total cost of repurchased shares				$ 47,800
Subsequent Events [Member] | 2016 To 2018 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized					$ 75,000

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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