Cost Reduction Actions (Activity of Facility Related Exit Costs) (Details) (USD $)	3 Months Ended		48 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Jul. 31, 2008
Cost Reduction Actions [Abstract]
Present value of estimated facility-related exit costs, beginning balance	$ 2,916,000		$ 2,100,000	$ 2,100,000
Cash payments made	(252,000)		(4,553,000)
Cash payments received	303,000		4,801,000
Interest accreted on the facility-related exit costs	52,000	45,000	671,000
Present value of estimated facility-related exit costs, ending balance	3,019,000		3,019,000	2,100,000
Amount of facility-related exit cost liability recorded as prepaid expenses	419,000		419,000
Amount recorded as other liabilities in the Condensed Consolidated Balance Sheet	$ 3,438,000		$ 3,438,000