Other Current Liabilities (Details) - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014	May. 31, 2014
Other Current Liabilities [Abstract]
Compensation and benefits	$ 16,031	$ 16,622	$ 15,558
Deferred revenues	9,334	8,979	7,964
Income tax payable	8,401	8,922	7,965
Warranties	7,304	9,331	9,220
Dealer related liabilities	5,287	7,103	6,841
Customer deposits	3,429	7,366	5,450
Other	14,557	15,620	12,175
Total other current liabilities	$ 64,343	$ 73,943	$ 65,173