Long-Term Obligations - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Debt Instrument [Line Items]
Debt, long-term and short-term	$ 253,699	$ 263,232
Notes payable	(10,411)	(61,422)
Long-term debt	243,288	201,810
USD-denominated China line of credit [Member]
Debt Instrument [Line Items]
Notes payable	(1,836)	(6,923)
CNY-denominated China line of credit [Member]
Debt Instrument [Line Items]
Notes payable	(8,575)	(12,499)
Euro-denominated notes payable in 2017 at a fixed rate of 3.71% [Member]
Debt Instrument [Line Items]
Long-term debt	32,960	40,164
Euro-denominated notes payable in 2020 at a fixed rate of 4.24% [Member]
Debt Instrument [Line Items]
Long-term debt	49,442	60,246
USD-denominated notes payable through 2016 at a fixed rate of 5.30% [Member]
Debt Instrument [Line Items]
Long-term debt	26,143	52,286
USD-denominated notes payable through 2017 at a fixed rate of 5.33% [Member]
Debt Instrument [Line Items]
Long-term debt	32,743	49,114
USD-Denominated Borrowing Credit Revolver [Member]
Debt Instrument [Line Items]
Long-term debt	$ 102,000	$ 42,000