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Stock-based Compensation (Tables)

12 Months Ended

Aug. 31, 2019

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, 2018		115,308	$	70.52
Granted		17,562	$	163.93
Converted to common shares		(35,813)	$	74.19
Forfeited		(137)	$	130.99
Outstanding at August 31, 2019		96,920	$	86.01	$	17,669
Vested at August 31, 2019		72,069	$	70.34	$	13,138

Market Share Units [Member]

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

Schedule Of Valuation Assumptions



	Fiscal Year Ended August 31,
	2019		2018		2017
Expected volatility		19.6%		20.4%		21.1%
Risk-free interest rate		3.0%		1.6%		1.0%
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, 2018		42,208	$	105.81
Granted		11,687	$	177.82
Performance factor adjustments		11,090	$	127.80
Converted to common shares		(24,752)	$	125.28
Forfeited		(709)	$	108.29
Outstanding at August 31, 2019 ⁽¹⁾		39,524	$	121.03	$	7,205

(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, 2018		30,768	$	108.14
Granted		20,043	$	160.37
Performance factor adjustments		(25,966)	$	110.65
Converted to common shares		(629)	$	94.54
Forfeited		(686)	$	160.37
Outstanding at August 31, 2019		23,530	$	148.70	$	4,290
Vested at August 31, 2019		4,173	$	94.54	$	761