Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Operating Activities
Net cash provided by operating activities	$ 14,033	$ 28,863
Investing Activities
Proceeds from sale of property, plant and equipment	(14,695)	(11,004)
Proceeds from sale of property, plant and equipment	244	4,636
Business acquisitions, net of cash acquired	0	(15,026)
Cash used in investing activities	(14,451)	(21,394)
Financing Activities
Net borrowings (repayment) on debt	(7,500)
Purchase of treasury shares	0	(9,352)
Taxes paid related to the net share settlement of equity awards	(920)	(1,332)
Stock option exercises, related tax benefits and other	6,598	2,245
Cash dividend	(2,358)	(2,376)
Intercompany Loan Activity	0	0
Cash used in financing activities	(4,180)	(11,025)
Effect of exchange rate changes on cash	(3,116)	(10,619)
Net decrease in cash and cash equivalents	(7,714)	(14,175)
Cash and cash equivalents – beginning of period	179,604	168,846
Cash and cash equivalents – end of period	171,890	154,671
Line of Credit | Senior Credit Facility - Revolver
Financing Activities
Net borrowings (repayment) on debt	0	(210)
Line of Credit | Senior Credit Facility - Term Loan
Financing Activities
Net borrowings (repayment) on debt	(7,500)	0
Reportable Legal Entities | Parent
Operating Activities
Net cash provided by operating activities	58,626	(1,531)
Investing Activities
Proceeds from sale of property, plant and equipment	(2,156)	(339)
Proceeds from sale of property, plant and equipment	0	13
Business acquisitions, net of cash acquired		0
Cash used in investing activities	(2,156)	(326)
Financing Activities
Net borrowings (repayment) on debt	(7,500)	0
Purchase of treasury shares		(9,352)
Taxes paid related to the net share settlement of equity awards	(920)	(1,332)
Stock option exercises, related tax benefits and other	6,598	2,245
Cash dividend	(2,358)	(2,376)
Intercompany Loan Activity	(53,734)	464
Cash used in financing activities	(57,914)	(10,351)
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	(1,444)	(12,208)
Cash and cash equivalents – beginning of period	7,953	18,688
Cash and cash equivalents – end of period	6,509	6,480
Reportable Legal Entities | Guarantors
Operating Activities
Net cash provided by operating activities	5,902	5,293
Investing Activities
Proceeds from sale of property, plant and equipment	(6,108)	(3,194)
Proceeds from sale of property, plant and equipment	135	2,672
Business acquisitions, net of cash acquired		0
Cash used in investing activities	(5,973)	(522)
Financing Activities
Net borrowings (repayment) on debt	0	0
Purchase of treasury shares		0
Taxes paid related to the net share settlement of equity awards	0	0
Stock option exercises, related tax benefits and other	0	0
Cash dividend	0	(5,338)
Intercompany Loan Activity	0	0
Cash used in financing activities	0	(5,338)
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	(71)	(567)
Cash and cash equivalents – beginning of period	71	567
Cash and cash equivalents – end of period	0	0
Reportable Legal Entities | Non-Guarantors
Operating Activities
Net cash provided by operating activities	8,906	30,439
Investing Activities
Proceeds from sale of property, plant and equipment	(6,431)	(7,471)
Proceeds from sale of property, plant and equipment	109	1,951
Business acquisitions, net of cash acquired		(15,026)
Cash used in investing activities	(6,322)	(20,546)
Financing Activities
Net borrowings (repayment) on debt	0
Purchase of treasury shares		0
Taxes paid related to the net share settlement of equity awards	0	0
Stock option exercises, related tax benefits and other	0	0
Cash dividend	(59,401)	0
Intercompany Loan Activity	53,734	(464)
Cash used in financing activities	(5,667)	(674)
Effect of exchange rate changes on cash	(3,116)	(10,619)
Net decrease in cash and cash equivalents	(6,199)	(1,400)
Cash and cash equivalents – beginning of period	171,580	149,591
Cash and cash equivalents – end of period	165,381	148,191
Reportable Legal Entities | Non-Guarantors | Line of Credit | Senior Credit Facility - Revolver
Financing Activities
Net borrowings (repayment) on debt		(210)
Eliminations
Operating Activities
Net cash provided by operating activities	(59,401)	(5,338)
Investing Activities
Proceeds from sale of property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Business acquisitions, net of cash acquired		0
Cash used in investing activities	0	0
Financing Activities
Net borrowings (repayment) on debt	0	0
Purchase of treasury shares		0
Taxes paid related to the net share settlement of equity awards	0	0
Stock option exercises, related tax benefits and other	0	0
Cash dividend	59,401	5,338
Intercompany Loan Activity	0	0
Cash used in financing activities	59,401	5,338
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents – beginning of period	0	0
Cash and cash equivalents – end of period	$ 0	$ 0