Cost Reduction Actions - Activity of Facility Related Exit Costs (Details) (USD $)	3 Months Ended		60 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Jul. 31, 2008
Cost Reduction Actions [Abstract]
Present value of estimated facility-related exit costs, beginning balance	$ 3,331,000		$ 2,100,000	$ 2,100,000
Cash payments made	(258,000)		(5,585,000)
Cash payments received	306,000		6,028,000
Accreted interest recorded	59,000	52,000	895,000
Present value of estimated facility-related exit costs, ending balance	3,438,000		3,438,000	2,100,000
Amount recorded as prepaid expenses in the Condensed Consolidated Balance Sheet	450,000		450,000
Amount recorded as other liabilities in the Condensed Consolidated Balance Sheet	$ 3,888,000		$ 3,888,000