Segment Information (Schedule Of Segment Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Segment Reporting Information [Line Items]
Sales to external customers	$ 190,924	$ 170,456	$ 160,804
Gross Profit	128,989	112,683	103,474
Adjusted EBITDA	31,402	27,056	21,157
Depreciation	3,008	3,142	3,567
Amortization	3,191	2,499	3,540
Segment Assets	189,405	164,080	151,427
Capital expenditures	4,418	4,730	5,465
United States/Canada [Member]
Segment Reporting Information [Line Items]
Sales to external customers	142,616	125,183	118,420
Gross Profit	91,637	78,618	71,782
Adjusted EBITDA	16,419	15,144	12,947
Depreciation	1,286	1,436	1,722
Amortization	3,180	2,483	3,525
Segment Assets	83,391	74,387	76,152
Capital expenditures	4,106	3,934	4,020
International [Member]
Segment Reporting Information [Line Items]
Sales to external customers	44,154	42,052	40,011
Gross Profit	35,146	32,616	31,037
Adjusted EBITDA	20,267	16,874	15,068
Depreciation	327	365	436
Amortization	11	16	15
Segment Assets	13,567	12,436	10,902
Capital expenditures	146	289	938
Reportable Unit Assets [Member]
Segment Reporting Information [Line Items]
Sales to external customers	186,770	167,235	158,431
Gross Profit	126,783	111,234	102,819
Adjusted EBITDA	36,686	32,018	28,015
Depreciation	1,613	1,801	2,158
Amortization	3,191	2,499	3,540
Segment Assets	96,958	86,823	87,054
Capital expenditures	4,252	4,223	4,958
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Sales to external customers	4,154	3,221	2,373
Gross Profit	2,206	1,449	655
Adjusted EBITDA	(5,284)	(4,962)	(6,858)
Depreciation	1,395	1,341	1,409
Segment Assets	92,447	77,257	64,373
Capital expenditures	$ 166	$ 507	$ 507