FIXED ASSETS

12 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

FIXED ASSETS

FIXED ASSETS

Fixed assets consist of the following (in thousands):

	Estimated Useful Life in Years	March 31,
		2018			2017
Furniture and fixtures	3-7	$	6,596		$	6,436
Computer equipment and internal use software	3-5	147,237			135,100
Demonstration and spare part units	2-5	31,338			28,036
Leasehold improvements (1)	up to 12	19,340			16,623
		204,511			186,195
Less – accumulated depreciation		(152,000		)	(124,802		)
		$	52,511		$	61,393

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

Depreciation expense was $34.7 million, $33.0 million and $26.6 million for the fiscal years ended March 31, 2018, 2017 and 2016, respectively.