The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
Intangible Assets (Details) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Jan. 31, 2014 Technologies [Member]	Jul. 31, 2013 Technologies [Member]	Jan. 31, 2014 Customer relationships [Member]	Jul. 31, 2013 Customer relationships [Member]	Jan. 31, 2014 Trademarks and other [Member]	Jul. 31, 2013 Trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period						11 years 9 months 18 days	11 years 8 months 12 days	10 years 0 months 0 days	10 years 0 months 0 days	20 years 0 months 0 days	20 years 0 months 0 days
Gross carrying amount	$ 82,995,000		$ 82,995,000		$ 83,269,000	$ 47,370,000	$ 47,494,000	$ 29,831,000	$ 29,831,000	$ 5,794,000	$ 5,944,000
Accumulated amortization	53,654,000		53,654,000		50,764,000	34,711,000	33,264,000	16,556,000	15,081,000	2,387,000	2,419,000
Net carrying amount	29,341,000		29,341,000		32,505,000	12,659,000	14,230,000	13,275,000	14,750,000	3,407,000	3,525,000
Amortization of intangibles	1,582,000	1,582,000	3,164,000	3,164,000
Amortization expense - year one	6,285,000		6,285,000
Amortization expense - year two	6,211,000		6,211,000
Amortization expense - year three	4,962,000		4,962,000
Amortization expense - year four	4,782,000		4,782,000
Amortization expense - year five	$ 4,782,000		$ 4,782,000