CONTINGENCIES AND COMMITMENTS (Details Textuals) (USD $)	12 Months Ended		0 Months Ended			12 Months Ended			2 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Jul. 31, 2012 site	Jul. 31, 2012 Surety Bond [Member]	Oct. 23, 2006 Ann Arbor Michigan Site [Member]	Aug. 09, 2001 Ann Arbor Michigan Site [Member]	Jun. 05, 2001 Ann Arbor Michigan Site [Member]	Jul. 31, 2000 Ann Arbor Michigan Site [Member]	Jul. 31, 2012 Ann Arbor Michigan Site [Member]	Jul. 31, 2011 Glen Cove, New York [Member]	Oct. 11, 2007 Federal Securities Class Actions [Member] lawsuit	Jul. 31, 2012 Federal Securities Class Actions [Member]	Oct. 05, 2007 Shareholder Derivative Lawsuits [Member] lawsuit	Jul. 31, 2012 Continuing Operations [Member]	Jul. 31, 2011 Continuing Operations [Member]	Jul. 31, 2010 Continuing Operations [Member]	Jul. 31, 2012 Discontinued Operations [Member]	Jul. 31, 2011 Discontinued Operations [Member]	Jul. 31, 2010 Discontinued Operations [Member]
Commitments and Contingencies [Line Items]
Number of lawsuits filed against the Company									4		2
Settlement amount										$ 22,500,000
Number of sites with environmental matters	3
Environmental liabilities	12,368,000
Stipulated penalties enforced for the separate alleged violations of the Consent Judgment					142,000	4,900,000
Reimbursement to State for Charges allegedly incurred for groundwater monitoring			494,000	227,000
Remediation reserve							8,149,000
Settlement Liability							500,000	2,000,000
Surety outstanding bonds relating primarily to long-term contracts with governmental agencies		160,040,000
Rent expenses for all operating leases												35,319,000	31,943,000	31,685,000	1,772,000	1,919,000	1,916,000
Minimum rental commitments for all non-cancelable operating leases due in 2013	24,816,000
Minimum rental commitments for all non-cancelable operating leases due in 2014	16,977,000
Minimum rental commitments for all non-cancelable operating leases due in 2015	9,894,000
Minimum rental commitments for all non-cancelable operating leases due in 2016	6,244,000
Minimum rental commitments for all non-cancelable operating leases due in 2017	4,138,000
Minimum rental commitments for all non-cancelable operating leases due in 2018 and thereafter	5,745,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2013	41,723,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2014	7,765,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2015	894,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2016	794,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2017	696,000
Non-cancelable future purchase commitments for goods or services with various vendors due in 2018 and thereafter	$ 6,591,000