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Stock-based Compensation (Tables)

12 Months Ended

Aug. 31, 2017

Stock Options [Member]

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

Schedule Of Stock Options Activity



							Weighted-Average
							Remaining
				Weighted-Average			Contractual Term
	Number of			Exercise Price			Per Share			Aggregate
Stock Options	Shares			Per Share			(in years)			Intrinsic Value
Outstanding at August 31, 2016		27,820		$	35.59
Granted		-		$	-
Exercised		(21,860)		$	35.47
Forfeited or expired		-		$	-
Outstanding at August 31, 2017		5,960		$	36.03			0.1		$	435
Exercisable at August 31, 2017		5,960		$	36.03			0.1		$	435




Restricted Stock Units [Member]

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

Schedule Of Restricted Stock Units Activity



				Weighted-Average
				Grant Date
	Number of			Fair Value			Aggregate
Restricted Stock Units	Shares			Per Share			Intrinsic Value
Outstanding at August 31, 2016		130,035		$	54.80
Granted		21,501		$	109.23
Converted to common shares		(34,479)		$	58.71
Forfeited		(287)		$	81.44
Outstanding at August 31, 2017		116,770		$	63.61		$	12,722
Vested at August 31, 2017		87,258		$	52.78		$	9,507




Market Share Units [Member]

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

Schedule Of Valuation Assumptions



	Fiscal Year Ended August 31,
	2017			2016			2015
Expected volatility		21.1%			22.2%			22.0%
Risk-free interest rate		1.0%			0.9%			0.8%
Expected dividend yield		0.0%			0.0%			0.0%




Schedule Of Market Share Units Activity



				Weighted-Average
				Grant Date
	Number of			Fair Value			Aggregate
Market Share Units	Shares			Per Share			Intrinsic Value
Outstanding at August 31, 2016		45,700		$	87.82
Granted		14,683		$	90.91
Performance factor adjustments		10,974		$	73.44
Converted to common shares		(25,825)		$	71.20
Forfeited		(613)		$	82.51
Outstanding at August 31, 2017 (1)		44,919		$	94.95		$	4,894




(1) This figure represents the total number of shares underlying MSU grants assuming achievement of the target number of shares at 100%. As the ultimate number of shares that vest could be as high as 200% of the target, the Company may be required to issue additional shares to satisfy outstanding MSU award grants.

Deferred Performance Units [Member]

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

Schedule Of Deferred Performance Share Units



				Weighted-Average
				Grant Date
	Number of			Fair Value			Aggregate
Deferred Performance Units	Shares			Per Share			Intrinsic Value
Outstanding at August 31, 2016		26,323		$	94.54
Granted		25,882		$	110.19
Performance factor adjustments		(21,240)		$	94.54
Converted to common shares		(89)		$	94.54
Forfeited		-		$	-
Outstanding at August 31, 2017		30,876		$	107.66		$	3,364
Vested at August 31, 2017		4,994		$	94.54		$	544




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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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