Discontinued Operations Balance Sheet, Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable—net		$ 39,667
Total inventories		16,451
Prepaid expenses and other current assets		922
Total current assets		57,040
Goodwill		37,032
Other intangible assets		914
Other		1,541
Property, plant and equipment—net		28,671
Total assets		125,198
Accounts payable		21,252
Wages and amounts withheld from employees		1,725
Other current liabilities		417
Total current liabilities		23,394
Other liabilities		1,142
Total liabilities		24,536		34,583
Net assets of disposal group		100,662
Less: write-down on disposal group	(15,658)	0	(15,658)
Repayments of Notes Payable		39,000	173,000
Net assets of disposal group at fair value		$ 85,004