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Summary of Significant Accounting Policies Other Comprehensive Income (Tables)
 12 Months Ended
Jul. 31, 2014
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table illustrates the changes in the balances of each component of accumulated other comprehensive income for the periods presented. The unrealized gain (loss) on cash flow hedges and the unrecognized gain on the postretirement medical plan are presented net of tax:
 
Unrealized gain (loss) on cash flow hedges
 
Gain on postretirement medical plan
 
Foreign currency translation adjustments
 
Accumulated other comprehensive income
Ending balance, July 31, 2012
$
876

 
$
978

 
$
57,557

 
$
59,411

Other comprehensive (loss) income before reclassification
(425
)
 
1,103

 
(3,446
)
 
(2,768
)
Amounts reclassified from accumulated other comprehensive income
(352
)
 
(228
)
 
—

 
(580
)
Ending balance, July 31, 2013
$
99

 
$
1,853

 
$
54,111

 
$
56,063

Other comprehensive (loss) income before reclassification
(21
)
 
3,313

 
1,334

 
4,626

Amounts reclassified from accumulated other comprehensive income
(90
)
 
(312
)
 
3,869

 
3,467

Ending balance, July 31, 2014
$
(12
)
 
$
4,854

 
$
59,314

 
$
64,156
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
As of July 31, 2014 and 2013, pre-tax amounts recognized in accumulated other comprehensive income in the accompanying consolidated balance sheets consist of:
 
 
2014
 
2013
Net actuarial gain
 
$
7,960

 
$
3,534

Prior service credit
 
2,011

 
1,203

 
 
$
9,971

 
$
4,737