Acquisitions and Divestitures - Schedule of Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014
Business Acquisition [Line Items]
Cash and cash equivalents	$ 12,904
Accounts receivable — net	21,178
Total inventories	16,788
Prepaid expenses and other current assets	4,233
Other assets	483
Property, plant and equipment	18,015
Accounts payable	(10,060)
Wages and amounts withheld from employees	(4,234)
Taxes other than income taxes	600
Accrued income taxes	(57)
Other current liabilities	(5,181)
Other long-term liabilities	(16,858)
Cost of acquired entity	314,061
Less: cash acquired	(12,904)
Fair value of total consideration	$ 301,157