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Share Repurchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Sep. 01, 2016
Equity, Class of Treasury Stock [Line Items]
Total cost of repurchased shares	$ 6,863	$ 3,893
2018 To 2020 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	41,184
Average price of shares repurchased	$ 166.60
Total cost of repurchased shares	$ 6,900

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- Definition

The cash outflow to reacquire common stock during the period.

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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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