Acquisitions and Divestitures - Schedule of Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Dec. 28, 2012 Precision Dynamics Corporation [Member]	Jul. 31, 2012 Pervaco [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 12,904
Current assets net of cash					5,082
Accounts receivable — net				21,178
Total inventories				16,788
Prepaid expenses and other current assets				4,233
Goodwill	515,004	617,236	676,791	168,150	22,844
Other intangible assets				109,300
Other assets				483
Property, plant and equipment				18,015	2,743
Total assets acquired net of cash					46,636
Accounts payable				(10,060)
Wages and amounts withheld from employees				(4,234)
Taxes, other than income taxes				(600)
Accrued income taxes				(57)
Liabilities assumed	0	37,747	8,987		7,555
Other current liabilities				(5,181)
Other long-term liabilities				(16,858)
Debt assumed					1,432
Net assets acquired				314,061	37,649
Fair value of total consideration				$ 301,157