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FIXED ASSETS
 12 Months Ended
Mar. 31, 2024
Property, Plant and Equipment [Abstract]  
FIXED ASSETS FIXED ASSETS
Fixed assets consisted of the following (in thousands):
 Estimated Useful Life in YearsMarch 31,
 20242023
Furniture and fixtures
3-7
$8,580 $9,786 
Computer equipment and internal use software
2-3
188,799 192,168 
Leasehold improvements (1)
up to 12
52,121 54,863 
Demonstration and spare part units
2-3
20,153 18,733 
269,653 275,550 
Less – accumulated depreciation(243,166)(240,815)
$26,487 $34,735 
(1) Leasehold improvements are depreciated over the shorter of the lease term or anticipated useful life of the improvement.
Depreciation expense was $15.9 million, $18.8 million and $20.1 million for the fiscal years ended March 31, 2024, 2023 and 2022, respectively.