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Share Repurchase Plan	6 Months Ended
	Feb. 28, 2018
Share Repurchase Plan [Abstract]
Share Repurchase Plan	Note 8. Share Repurchase Plan   On June 21, 2016, the Company’s Board of Directors approved a share buy-back plan. Under the plan, which became effective on September 1, 2016, the Company is authorized to acquire up to $75.0 million of its outstanding shares through August 31, 2018. The timing and amount of repurchases are based on terms and conditions as may be acceptable to the Company’s Chief Executive Officer and Chief Financial Officer and in compliance with all laws and regulations applicable thereto. During the period from September 1, 2016 through February 28, 2018, the Company repurchased 386,973 shares at a total cost of $42.5 million under this $75.0 million plan. During the six months ended February 28, 2018, the Company repurchased 96,400 shares at an average price of $118.01 per share, for a total cost of $11.4 million.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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