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Accounts Receivable, Net (Tables)
 12 Months Ended
Jul. 31, 2016
Accounts Receivable, Net [Abstract]  
Schedule of accounts receivable
Accounts receivable, net consisted of:
 
July 31,
(In thousands)
2016
 
2015
Advance charges receivable
$
182,824

 
$
143,724

Trade accounts receivable
86,455

 
73,773

Other receivables
1,111

 
1,187

 
270,390

 
218,684

Less: allowance for doubtful accounts
(4,120
)
 
(2,988
)
Accounts receivable, net
$
266,270

 
$
215,696
Schedule of movements in the allowance for doubtful accounts
The movements in the allowance for doubtful accounts were as follows:
 
July 31,
(In thousands)
2016
 
2015
 
2014
Balance at beginning of year
$
2,988

 
$
3,584

 
$
2,683

Charged to costs and expenses
3,646

 
2,221

 
3,376

Deductions to bad debt
(2,514
)
 
(2,817
)
 
(2,475
)
Balance at end of year
$
4,120

 
$
2,988

 
$
3,584