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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive (Loss) Income, Balance, beginning     $ (15,039)  
Other comprehensive loss before reclassifications, net of tax     (230)  
Amounts reclassified from accumulated other comprehensive income, net of tax     634  
Curtailment on Pension Plan     5,040  
Net current-period other comprehensive income (loss), net of tax $ 6 $ (175) (5,444) $ (430)
Accumulated Other Comprehensive (Loss) Income, Balance, ending (9,595)   (9,595)  
Pension and Postretirement Health Benefits        
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive (Loss) Income, Balance, beginning     (14,891)  
Other comprehensive loss before reclassifications, net of tax     0  
Amounts reclassified from accumulated other comprehensive income, net of tax     634  
Curtailment on Pension Plan     5,040  
Net current-period other comprehensive income (loss), net of tax     (5,674)  
Accumulated Other Comprehensive (Loss) Income, Balance, ending (9,217)   (9,217)  
Cumulative Translation Adjustment        
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive (Loss) Income, Balance, beginning     (148)  
Other comprehensive loss before reclassifications, net of tax     (230)  
Amounts reclassified from accumulated other comprehensive income, net of tax     0  
Curtailment on Pension Plan     0  
Net current-period other comprehensive income (loss), net of tax     230  
Accumulated Other Comprehensive (Loss) Income, Balance, ending $ (378)   $ (378)