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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Apr. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Summary of the Company's available-for-sale investments by category
The following is a summary of the Company’s available-for-sale investment securities by category which are classified within other non-current assets in the Company’s condensed consolidated balance sheets. Contractual maturity dates of debt securities held by the trust at April 30, 2013 range from 2013 to 2044.
 
Cost/
Amortized
Cost Basis
 
Fair Value
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Net Unrealized
Holding
Gains/(Losses)
April 30, 2013
 
 
 
 
 
 
 
 
 
Equity securities
$
176

 
$
177

 
$
1

 
$
—

 
$
1

Debt securities:
 
 
 
 
 
 
 
 
 
Corporate
31,032

 
32,920

 
1,905

 
(17
)
 
1,888

U.S. Treasury
8,748

 
9,231

 
488

 
(5
)
 
483

Federal agency
22,698

 
24,181

 
1,543

 
(60
)
 
1,483

Mortgage-backed
5,775

 
6,129

 
374

 
(20
)
 
354

Municipal government
1,000

 
1,000

 
—

 
—

 
—

 
$
69,429

 
$
73,638

 
$
4,311

 
$
(102
)
 
$
4,209

 
 
 
 
 
 
 
 
 
 
July 31, 2012
 
 
 
 
 
 
 
 
 
Equity securities
$
212

 
$
206

 
$
—

 
$
(6
)
 
$
(6
)
Debt securities:
 
 
 
 
 
 
 
 
 
Corporate
30,548

 
32,378

 
1,838

 
(8
)
 
1,830

U.S. Treasury
8,049

 
8,610

 
562

 
(1
)
 
561

Federal agency
25,454

 
27,231

 
1,777

 
—

 
1,777

Mortgage-backed
6,129

 
6,392

 
290

 
(27
)
 
263

Municipal government
1,000

 
1,004

 
4

 
—

 
4

 
$
71,392

 
$
75,821

 
$
4,471

 
$
(42
)
 
$
4,429
Gross unrealized losses and fair value of Company's available-for-sale investments with unrealized losses aggregated by investment category and length of time
The following table shows the gross unrealized losses and fair value of the Company’s available-for-sale investments with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
Less than 12 months
 
12 months or greater
 
Total
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
April 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Corporate
$
2,476

 
$
(17
)
 
$
—

 
$
—

 
$
2,476

 
$
(17
)
U.S. Treasury
401

 
(5
)
 
—

 
—

 
401

 
(5
)
Mortgage-backed
—

 
—

 
1,509

 
(20
)
 
1,509

 
(20
)
Federal agency
2,441

 
(60
)
 
—

 
—

 
2,441

 
(60
)
 
$
5,318

 
$
(82
)
 
$
1,509

 
$
(20
)
 
$
6,827

 
$
(102
)
 
Less than 12 months
 
12 months or greater
 
Total
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
July 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed
$
—

 
$
—

 
$
1,504

 
$
(27
)
 
$
1,504

 
$
(27
)
U.S. Treasury
589

 
(1
)
 
—

 
—

 
589

 
(1
)
Corporate
—

 
—

 
462

 
(8
)
 
462

 
(8
)
Equity securities
27

 
(6
)
 
—

 
—

 
27

 
(6
)
 
$
616

 
$
(7
)
 
$
1,966

 
$
(35
)
 
$
2,582

 
$
(42
)
Proceeds and gross gains and losses from the sale of available-for-sale investments
The following table shows the proceeds and gross gains and losses from the sale of available-for-sale investments for the three and nine months ended April 30, 2013 and April 30, 2012:
 
Three Months Ended
 
Nine Months Ended
 
Apr 30, 2013
 
Apr 30, 2012
 
Apr 30, 2013
 
Apr 30, 2012
Proceeds from sales
$
883

 
$
5,473

 
$
13,169

 
$
26,700

Realized gross gains on sales
18

 
176

 
370

 
9,654

Realized gross losses on sales
—

 
12

 
5

 
28