Intangible Assets (Tables)

3 Months Ended

Oct. 31, 2012

Finite-Lived Intangible Assets, Net [Abstract]

Intangible assets with finite lives

	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