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Stock-based Compensation (Tables)

12 Months Ended

Aug. 31, 2012

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Stock Option Award Activity

Stock Options		Number of Shares				Weighted-Average Exercise Price per Share				Weighted-Average Remaining Contractual Term per Share (in years)				Aggregate Intrinsic  Value
Outstanding at August 31, 2011			520,730			$	33.43
Granted			0			$	0
Exercised			(207,463	)		$	33.89
Forfeited or expired			0			$	0
Outstanding at August 31, 2012			313,267			$	33.12				3.9			$	4,914
Exercisable at August 31, 2012			313,267			$	33.12				3.9			$	4,914

Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Restricted Stock Unit Activity

Restricted Stock Units		Number of Shares				Weighted-Average Grant Date Fair Value per Share				Aggregate Intrinsic Value
Outstanding at August 31, 2011			191,757			$	34.10
Granted			47,191			$	39.71
Converted to common shares			(69,044	)		$	33.16
Forfeited			0			$	0
Outstanding at August 31, 2012			169,904			$	36.03			$	8,293
Vested at August 31, 2012			75,430			$	34.97			$	3,682

Performance Share Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Performance Share Unit Activity

Performance Share Units		Number of Shares				Weighted-Average Grant Date Fair Value per Share				Aggregate Intrinsic Value
Outstanding at August 31, 2011			48,000			$	34.48
Granted			17,180			$	39.61
Converted to common shares			(12,840	)		$	32.08
Forfeited			(11,160	)		$	32.08
Outstanding at August 31, 2012			41,180			$	38.02			$	2,010
Expected to vest at August 31, 2012			28,700			$	38.51			$	1,401

X

- Definition

Tabular disclosure of the changes in outstanding nonvested performance-based units.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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