Derivatives and Hedging Activities (Tables)
 9 Months Ended
Apr. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the amount of pre-tax gains and losses related to derivatives designated as hedging instruments:

 Three months ended April 30,Nine months ended April 30,
  2020201920202019
(Losses) gains recognized in OCI:
Foreign exchange contracts (cash flow hedges)$(1,751) $220  $(1,192) $377  
Foreign currency denominated debt (net investment hedges)707  1,314  1,260  2,336  
Gains reclassified from OCI into cost of goods sold:
Forward exchange contracts (cash flow hedges)293  292  779  579  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
  April 30, 2020July 31, 2019
Designated as cash flow hedges$21,533  $26,013  
Non-designated hedges2,707  3,376  
Total foreign exchange contracts$24,240  $29,389  
Fair Values of Derivative Instruments in Consolidated Balance Sheets
Fair values of derivative instruments in the condensed consolidated balance sheets were as follows:

 April 30, 2020July 31, 2019
  Prepaid expenses and other current assetsOther current liabilitiesCurrent maturities on
long-term obligations		Prepaid expenses and other current assetsOther current liabilitiesCurrent maturities on
long-term obligations
Derivatives designated as hedging instruments:
Foreign exchange contracts (cash flow hedges)$176  $—  $—  $472  $—  $—  
Foreign currency denominated debt (net investment hedges)—  —  48,929  —  —  50,189  
Derivatives not designated as hedging instruments:
Foreign exchange contracts65  1,360  —  2  5  —  
Total derivative instruments$241  $1,360  $48,929  $474  $5  $50,189