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Accounts Receivable, Net (Tables)
 12 Months Ended
Jul. 31, 2017
Accounts Receivable, Net [Abstract]  
Schedule of accounts receivable
Accounts receivable, net consisted of:
 
 
July 31,
(In thousands)
 
2017
 
2016
Advance charges receivable
 
$
204,097

 
$
182,824

Trade accounts receivable
 
110,189

 
86,455

Other receivables
 
1,871

 
1,111

 
 
316,157

 
270,390

Less: Allowance for doubtful accounts
 
(4,311
)
 
(4,120
)
Accounts receivable, net
 
$
311,846

 
$
266,270
Schedule of movements in the allowance for doubtful accounts
The movements in the allowance for doubtful accounts were as follows:
 
 
July 31,
(In thousands)
 
2017
 
2016
 
2015
Balance at beginning of year
 
$
4,120

 
$
2,988

 
$
3,584

Charged to costs and expenses
 
2,928

 
3,646

 
2,221

Deductions to bad debt
 
(2,737
)
 
(2,514
)
 
(2,817
)
Balance at end of year
 
$
4,311

 
$
4,120

 
$
2,988