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Other Comprehensive Income Other Comprehensive Income, Net of Tax (Tables)
 3 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table illustrates the changes in the balances of each component of accumulated other comprehensive loss, net of tax, for the three months ended October 31, 2018:
 
Unrealized gain on cash flow hedges
 
Unamortized gain on post-retirement plans
 
Foreign currency translation adjustments
 
Accumulated other comprehensive loss
Beginning balance, July 31, 2018
$
863

 
$
3,302

 
$
(60,566
)
 
$
(56,401
)
Other comprehensive loss before reclassification
(491
)
 
—

 
(9,149
)
 
(9,640
)
Amounts reclassified from accumulated other comprehensive loss
(35
)
 
(155
)
 
—

 
(190
)
Ending balance, October 31, 2018
$
337

 
$
3,147

 
$
(69,715
)
 
$
(66,231
)
The changes in accumulated other comprehensive loss by component, net of tax, for the three months ended October 31, 2017, were as follows:
 
Unrealized gain (loss) on cash flow hedges
 
Unamortized gain on post-retirement plans
 
Foreign currency translation adjustments
 
Accumulated other comprehensive loss
Beginning balance, July 31, 2017
$
109

 
$
2,620

 
$
(47,411
)
 
$
(44,682
)
Other comprehensive loss before reclassification
(419
)
 
—

 
(6,846
)
 
(7,265
)
Amounts reclassified from accumulated other comprehensive loss
15

 
(130
)
 
—

 
(115
)
Ending balance, October 31, 2017
$
(295
)
 
$
2,490

 
$
(54,257
)
 
$
(52,062
)
Other Comprehensive Income , Tax
The following table illustrates the income tax expense on the components of other comprehensive loss for the three months ended October 31, 2018 and 2017:
 
Three months ended October 31,
 
2018
 
2017
Income tax expense related to items of other comprehensive loss:
 
 
 
Net investment hedge translation adjustments
$
(405
)
 
$
(301
)
Cash flow hedges
(100
)
 
(195
)
Other income tax adjustments and currency translation
47

 
11

Income tax expense related to items of other comprehensive loss
$
(458
)
 
$
(485
)