Long-Term Obligations - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Debt Instrument [Line Items]
Debt, long-term and short-term	$ 216,910	$ 253,699
Notes payable	(4,928)	(10,411)
Long-term debt	211,982	243,288
USD-denominated China line of credit [Member]
Debt Instrument [Line Items]
Notes payable	0	(1,836)
CNY-denominated China line of credit [Member]
Debt Instrument [Line Items]
Notes payable	(4,928)	(8,575)
Euro-denominated notes payable in 2017 at a fixed rate of 3.71% [Member]
Debt Instrument [Line Items]
Long-term debt	33,459	32,960
Euro-denominated notes payable in 2020 at a fixed rate of 4.24% [Member]
Debt Instrument [Line Items]
Long-term debt	50,188	49,442
USD-denominated notes payable through 2016 at a fixed rate of 5.30% [Member]
Debt Instrument [Line Items]
Long-term debt	0	26,143
USD-denominated notes payable through 2017 at a fixed rate of 5.33% [Member]
Debt Instrument [Line Items]
Long-term debt	16,335	32,743
USD-Denominated Borrowing Credit Revolver [Member]
Debt Instrument [Line Items]
Long-term debt	$ 112,000	$ 102,000