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Share Repurchase Plan	12 Months Ended
Share Repurchase Plan	Aug. 31, 2018
Share Repurchase Plan [Abstract]
Share Repurchase Plan	Note 8. Share Repurchase Plans 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 was authorized to acquire up to $75.0 million of its outstanding shares through August 31, 2018. The timing and amount of repurchases were based on terms and conditions that were 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 August 31, 2018, the Company repurchased 465,879 shares at a total cost of $53.7 million under this $75.0 million plan. During fiscal year 2018, the Company repurchased 175,306 shares at an average price of $128.99 per share, for a total cost of $22.6 million On June 19, 2018, the Company’s Board of Directors approved a new share buy-back plan. Under the plan, which became effective on September 1, 2018 and will remain in effect through August 31, 2020, the Company is authorized to acquire up to $75.0 million of its outstanding shares 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 thereto.