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Share Repurchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Sep. 01, 2018
Equity, Class of Treasury Stock [Line Items]
Total cost of repurchased shares	$ 12,061	$ 11,377
2016 To 2018 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized			$ 75,000
Share buy-back plan, number of shares repurchased	70,684
Average price of shares repurchased	$ 170.60
Total cost of repurchased shares	$ 12,100

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow to reacquire common stock during the period.

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-Topic 230
-SubTopic 10
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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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