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Share Repurchase Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	12 Months Ended			24 Months Ended
	Aug. 31, 2020	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Total cost of repurchased shares		$ 16,825	$ 29,625	$ 22,616
2018 To 2020 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, number of shares repurchased	0	92,583			268,538
Average price of shares repurchased		$ 181.71
Total cost of repurchased shares		$ 16,800			$ 46,400
Maximum [Member] | 2018 To 2020 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized	$ 75,000	$ 75,000			$ 75,000

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The cash outflow to reacquire common stock during the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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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.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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