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Share Repurchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		33 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020
Equity, Class of Treasury Stock [Line Items]
Total cost of repurchased shares	$ 16,825	$ 22,384
2018 To 2020 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized	$ 75,000		$ 75,000
Share buy-back plan, number of shares repurchased	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

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The cash outflow to reacquire common stock during the period.

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-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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