Overview and Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Mar. 31, 2020
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life (in years)	40 years
Computers and related equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life (in years)	4 years
Computers and related equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life (in years)	5 years
Furniture and other equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life (in years)	2 years
Furniture and other equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life (in years)	15 years