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Summary of Significant Accounting Policies Schedule of Other Intangibles (Tables)
 24 Months Ended
Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
 
July 31, 2013
 
July 31, 2012
 
Weighted
Average
Amortization
Period
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Book
Value
 
Weighted
Average
Amortization
Period
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Book
Value
Amortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Patents
5
 
$
11,053

 
$
(9,597
)
 
$
1,456

 
5
 
$
10,418

 
$
(9,058
)
 
$
1,360

Tradenames and other
5
 
15,289

 
(8,398
)
 
6,891

 
7
 
8,945

 
(7,094
)
 
1,851

Customer relationships
8
 
261,076

 
(144,620
)
 
116,456

 
7
 
164,392

 
(128,805
)
 
35,587

Non-compete agreements and other
4
 
14,942

 
(14,215
)
 
727

 
4
 
15,988

 
(15,417
)
 
571

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tradenames
N/A
 
31,321

 
—

 
31,321

 
N/A
 
44,750

 
—

 
44,750

Total
 
 
$
333,681

 
$
(176,830
)
 
$
156,851

 
 
 
$
244,493

 
$
(160,374
)
 
$
84,119