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Long-Term Obligations (Tables)
 12 Months Ended
Jul. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Total debt consists of the following as of July 31:
 
 
2018
 
2017
Euro-denominated notes payable in 2020 at a fixed rate of 4.24%
 
$
52,618

 
$
53,202

USD-denominated borrowing on revolving loan agreement at a weighted average rate of 0.00% and 1.94% as of July 31, 2018 and 2017, respectively
 
—

 
16,998

EUR-denominated borrowing on revolving loan agreement at a weighted average rate of 0.00% and 0.75% as of July 31, 2018 and 2017, respectively
 
—

 
34,336

CNY-denominated borrowing on China revolving loan agreement at a weighted average rate of 0.00% and 3.92% as of July 31, 2018 and 2017, respectively
 
—

 
2,228

USD-denominated borrowing on China revolving loan agreement at a weighted average rate of 0.00% and 2.63% as of July 31, 2018 and 2017, respectively
 
—

 
1,000

 
 
$
52,618

 
$
107,764

Less notes payable
 
—

 
(3,228
)
Total long-term debt
 
$
52,618

 
$
104,536
Schedule of Maturities of Long-term Debt
Maturities on long-term debt are as follows:
Years Ending July 31,
 
2019
$
—

2020
52,618

Total
$
52,618