Intangible Assets

3 Months Ended

Oct. 31, 2012

Finite-Lived Intangible Assets, Net [Abstract]

Intangible Assets

(18)    Intangible Assets

Intangible assets with finite lives as of October 31, 2012 and July 31, 2012 are as follows:

	October 31, 2012
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization	Net Carrying Amount
Technologies	11.7	$	47,494,000	30,906,000	$	16,588,000
Customer relationships	10.0	29,831,000		12,869,000	16,962,000
Trademarks and other	20.0	5,944,000		2,243,000	3,701,000
Total		$	83,269,000	46,018,000	$	37,251,000

	July 31, 2012
	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization	Net Carrying Amount
Technologies	11.7	$	47,694,000	30,321,000	$	17,373,000
Customer relationships	10.0	29,931,000		12,231,000	17,700,000
Trademarks and other	20.0	6,044,000		2,284,000	3,760,000
Total		$	83,669,000	44,836,000	$	38,833,000

The weighted average amortization period in the above table excludes fully amortized intangible assets. Amortization expense for the three months ended October 31, 2012 and 2011 was $1,582,000, and $1,719,000, respectively.

The estimated amortization expense for the fiscal years ending July 31, 2013, 2014, 2015, 2016, and 2017 is $6,327,000, $6,285,000, $6,211,000, $4,962,000 and $4,782,000, respectively.

In connection with the wind-down of our mobile data communications segment's microsatellite product line, certain fully amortized intangible assets related to this product line are no longer reflected in the gross carrying amount or accumulated amortization of our intangible assets as of October 31, 2012.