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Intangible Assets
 3 Months Ended
Oct. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract]  
Intangible Assets Intangible Assets
Intangible assets with finite lives are as follows:
 October 31, 2021
 Weighted Average
Amortization Period		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Customer relationships20.2$302,058,000 96,786,000 $205,272,000 
Technologies14.8114,949,000 72,143,000 42,806,000 
Trademarks and other16.732,926,000 17,654,000 15,272,000 
Total $449,933,000 186,583,000 $263,350,000 

 July 31, 2021
 Weighted Average
Amortization Period		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Customer relationships20.2$302,058,000 93,215,000 $208,843,000 
Technologies14.8114,949,000 70,924,000 44,025,000 
Trademarks and other16.732,926,000 17,095,000 15,831,000 
Total $449,933,000 181,234,000 $268,699,000 

The weighted average amortization period in the above table excludes fully amortized intangible assets.

Amortization expense for the three months ended October 31, 2021 and 2020 was $5,349,000 and $5,566,000, respectively.

The estimated amortization expense consists of the following for the fiscal years ending July 31:
2022$21,685,000 
202321,781,000 
202421,154,000 
202521,041,000 
202619,888,000 

We review net intangible assets with finite lives for impairment when an event occurs indicating the potential for impairment. Based on our last assessment, we believe that the carrying values of our net intangible assets were recoverable as of October 31, 2021. However, if business conditions deteriorate, we may be required to record impairment losses, and or increase the amortization of intangibles in the future. Any impairment charges that we may record in the future could be material to our results of operations and financial condition.