Employee Retirement Plans (Narrative) (Details)	6 Months Ended
	Sep. 30, 2020 USD ($)
Non-qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	$ 200,000
Expected employer contributions, remainder of fiscal year	200,000
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	0
Expected employer contributions, remainder of fiscal year	$ 1,000,000.0