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Stock-based Compensation (Schedule Of Deferred Performance Share Units) (Details) - Deferred Performance Units [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	30,768
Granted, Number of Shares	20,043
Performance factor adjustment, Number of Shares	(25,966)
Converted to common shares, Number of Shares	(629)
Forfeited, Number of Shares	(686)
Outstanding, Number of Shares	23,530	30,768
Vested, Number of Shares	4,173
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 108.14
Granted, Weighted-Average Grant Date Fair Value Per Share	160.37	$ 110.65	$ 110.19
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share	110.65
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share	94.54
Forfeited, Weighted-Average Grant Date Fair Value Per Share	160.37
Outstanding, Weighted-Average Grant Date Fair Value Per Share	148.70	$ 108.14
Vested, Weighted-Average Grant Date Fair Value Per Share	$ 94.54
Outstanding, Aggregate Intrinsic Value	$ 4,290
Vested, Aggregate Intrinsic Value	$ 761
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares	100.00%

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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