Segment Reporting - Sales By Geographic Regions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
International sales by geographic regions	$ 40,301	$ 36,636	$ 25,017
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
International sales by geographic regions	290	6	31
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
International sales by geographic regions	1,064	277	119
U.S. Only
Revenues from External Customers and Long-Lived Assets [Line Items]
International sales by geographic regions	37,503	35,287	24,274
South America
Revenues from External Customers and Long-Lived Assets [Line Items]
International sales by geographic regions	$ 1,444	$ 1,066	$ 593