Business Segments and International Operations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2014 Segments	Nov. 30, 2013	Nov. 30, 2012
Segment Reporting [Abstract]
Number of reportable segments	3
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 59,351	$ 57,030
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	56,900	53,600	57,900
Outside United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,500	$ 3,400	$ 5,200