Schedule of Fixed Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Fixed assets:
Total cost	$ 642,107	$ 705,206
Less: accumulated depreciation and amortization	(492,118)	(556,800)
Fixed assets, net	149,989	148,406
Equipment
Fixed assets:
Total cost	159,421	172,308
Software
Fixed assets:
Total cost	269,944	323,088
Leasehold improvements
Fixed assets:
Total cost	$ 212,742	$ 209,810