Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Domestic and foreign pre-tax income
United States	$ 52,723	$ 40,928	$ 31,168
Foreign	8,169	9,182	10,058
Income before income taxes	60,892	50,110	41,226
Current:
Federal	17,714	14,777	11,831
State	1,872	1,821	1,475
Foreign	1,555	2,023	2,077
Total current income tax provision	21,141	18,621	15,383
Deferred:
Federal	(1,984)	(879)	(405)
State	(453)	(324)	(188)
Foreign	174	(115)	23
Total deferred income tax provision (benefit)	(2,263)	(1,318)	(570)
Total income tax provision	$ 18,878	$ 17,303	$ 14,813
Reconciliation of the effective income tax rate on continuing operations with the U.S. federal statutory income tax rate
Federal statutory rates (as a percent)	35.00%	35.00%	35.00%
Adjustment resulting from the tax effect of:
State and local taxes, net of federal benefit (as a percent)	1.50%	1.90%	2.00%
Domestic production deduction (as a percent)	(2.50%)	(2.90%)	(2.00%)
Foreign tax rate differential (as a percent)	(1.40%)	(2.50%)	(3.20%)
Adjustment to uncertain tax position (as a percent)	(0.00%)	(0.00%)	(0.50%)
Research credit generated (as a percent)	(0.30%)	(0.30%)	(0.30%)
Stock Compensation	(3.10%)	0.00%	0.00%
Noncontrolling partnership interest (as a percent)	(0.00%)	(0.00%)	(0.10%)
Permanent items (as a percent)	1.60%	0.00%	0.00%
Tax effect of undistributed earnings (as a percent)	1.40%	2.70%	3.40%
Other (as a percent)	(1.20%)	0.60%	0.60%
Effective income tax rate (as a percent)	31.00%	34.50%	35.90%