Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
	Mar. 31, 2021 USD ($)
Change in Accounting Estimate [Line Items]
Decrease in Net Revenue due to Change in Estimated Offering Period	$ 333,000,000
Decrease in Net Income due to Change in Estimated Offering Period	280,000,000
Decrease in Diluted Earnings Per Share due to Change in Estimated Offering Period	$ 0.96
Recognized at a point in time
Change in Accounting Estimate [Line Items]
Percentage of sales price	75.00%
Recognized over time
Change in Accounting Estimate [Line Items]
Percentage of sales price	25.00%