DISCONTINUED OPERATIONS (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Apr. 28, 2012	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Jul. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ (3,336)		$ (3,993)
Expected proceeds from divestiture of component	550,000
Number of employees to be transferred	1,300
Expected proceeds from divestiture of component net of holdback	535,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		3,336		3,993
Net sales		57,180	56,016	169,493	162,038
Earnings from discontinued operations before income taxes		11,782	13,589	39,865	41,870
Provision for income taxes		3,802	4,278	11,999	12,778
Earnings from discontinued operations, net of income taxes		7,980	9,311	27,866	29,092
Inventory		40,651		40,651		37,125
Prepaid expenses and other current assets		1,806		1,806		2,698
Total current assets		42,457		42,457		39,823
Property, plant, and equipment		61,623		61,623		64,567
Goodwill		22,018		22,018		19,261
Intangible Assets		567		567		683
Other non-current assets		72		72		174
Total non-current assets		84,280		84,280		84,685
Total assets		126,737		126,737		124,508
Total liabilities		$ 1,557		$ 1,557		$ 1,817