FIXED ASSETS

12 Months Ended

Mar. 31, 2021

Fixed assets consisted of the following (in thousands):



	Estimated Useful Life in Years	March 31,
		2021		2020
Furniture and fixtures	3-7	$	9,742	$	9,561
Computer equipment and internal use software	3-5	177,098		170,518

Leasehold improvements (1)	up to 12	53,980		51,910
Demonstration and spare part units	2-5	17,968		19,626
		258,788		251,615
Less – accumulated depreciation		(210,314)		(193,900)
		$	48,474	$	57,715

(1) Leasehold improvements are depreciated over the shorter of the lease term or anticipated useful life of the improvement.

A typographical error in the prior year presentation of the above disclosure has been corrected in the current period.

Depreciation expense was $22.4 million, $23.4 million and $27.4 million for the fiscal years ended March 31, 2021, 2020 and 2019, respectively.