Cost Reduction Actions - Activity of Facility Related Exit Costs (Details) (USD $)	12 Months Ended			69 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2014	Jul. 31, 2008
Restructuring Reserve [Roll Forward]
Present value of estimated facility-related exit costs, beginning balance	$ 3,331,000			$ 2,100,000	$ 2,100,000
Cash payments made	(1,069,000)			(6,396,000)
Cash payments received	1,264,000			6,986,000
Accreted interest recorded	247,000	217,000	189,000	1,083,000
Present value of estimated facility-related exit costs, ending balance	3,773,000	3,331,000		3,773,000	2,100,000
Amount recorded as prepaid expenses in the Consolidated Balance Sheet	462,000			462,000
Amount recorded as other liabilities in the Consolidated Balance Sheet	$ 4,235,000			$ 4,235,000