Condensed Consolidating Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Operating Activities
Net cash provided by operating activities	$ 32,946	$ 12,275
Investing Activities
Proceeds from sale of property, plant and equipment	1,913	977
Capital expenditures	(11,257)	(7,689)
Business acquisitions, net of cash acquired	0	(83)
Net cash used in investing activities	(9,344)	(6,795)
Financing Activities
Net repayments on revolver	(12,000)	0
Principal repayments of term loans	0	1,250
Intercompany loan activity	0	0
Purchase of treasury shares	(15,352)	(7,142)
Stock option exercises and related tax benefits	10,562	5,473
Payment of contingent acquisition consideration	(414)	0
Cash dividend	(2,919)	(2,911)
Net cash used in financing activities	(20,123)	(5,830)
Effect of exchange rate changes on cash	2,077	477
Net increase in cash and cash equivalents	5,556	127
Cash and cash equivalents – beginning of period	103,986	68,184
Cash and cash equivalents – end of period	109,542	68,311
Parent
Operating Activities
Net cash provided by operating activities	17,415	(658)
Investing Activities
Proceeds from sale of property, plant and equipment	0	571
Capital expenditures	(1,208)	(399)
Business acquisitions, net of cash acquired		0
Net cash used in investing activities	(1,208)	172
Financing Activities
Net repayments on revolver	(12,000)
Principal repayments of term loans		1,250
Intercompany loan activity	(9,951)	(4,991)
Purchase of treasury shares	(15,352)	(7,142)
Stock option exercises and related tax benefits	10,562	5,473
Payment of contingent acquisition consideration	0
Cash dividend	(2,919)	(2,911)
Net cash used in financing activities	(29,660)	(10,821)
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	(13,453)	(11,307)
Cash and cash equivalents – beginning of period	16,122	12,401
Cash and cash equivalents – end of period	2,669	1,094
Guarantors
Operating Activities
Net cash provided by operating activities	3,461	4,779
Investing Activities
Proceeds from sale of property, plant and equipment	36	14
Capital expenditures	(1,270)	(1,291)
Business acquisitions, net of cash acquired		0
Net cash used in investing activities	(1,234)	(1,277)
Financing Activities
Net repayments on revolver	0
Principal repayments of term loans		0
Intercompany loan activity	(2,227)	(3,593)
Purchase of treasury shares	0	0
Stock option exercises and related tax benefits	0	0
Payment of contingent acquisition consideration	0
Cash dividend	0	0
Net cash used in financing activities	(2,227)	(3,593)
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	(91)
Cash and cash equivalents – beginning of period	0	91
Cash and cash equivalents – end of period	0	0
Non-Guarantors
Operating Activities
Net cash provided by operating activities	12,070	8,154
Investing Activities
Proceeds from sale of property, plant and equipment	1,877	392
Capital expenditures	(8,779)	(5,999)
Business acquisitions, net of cash acquired		(83)
Net cash used in investing activities	(6,902)	(5,690)
Financing Activities
Net repayments on revolver	0
Principal repayments of term loans		0
Intercompany loan activity	12,178	8,584
Purchase of treasury shares	0	0
Stock option exercises and related tax benefits	0	0
Payment of contingent acquisition consideration	(414)
Cash dividend	0	0
Net cash used in financing activities	11,764	8,584
Effect of exchange rate changes on cash	2,077	477
Net increase in cash and cash equivalents	19,009	11,525
Cash and cash equivalents – beginning of period	87,864	55,692
Cash and cash equivalents – end of period	106,873	67,217
Eliminations
Operating Activities
Net cash provided by operating activities	0	0
Investing Activities
Proceeds from sale of property, plant and equipment	0	0
Capital expenditures	0	0
Business acquisitions, net of cash acquired		0
Net cash used in investing activities	0	0
Financing Activities
Net repayments on revolver	0
Principal repayments of term loans		0
Intercompany loan activity	0	0
Purchase of treasury shares	0	0
Stock option exercises and related tax benefits	0	0
Payment of contingent acquisition consideration	0
Cash dividend	0	0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net increase 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