Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
FY21 Change in Estimated Offering Period [Member]
Change in Accounting Estimate [Line Items]
Increase in Net Revenue due to Change in Estimated Offering Period	$ 331,000,000
Decrease in Net Revenue due to Change in Estimated Offering Period		$ 333,000,000
Increase in Net Income due to Change in Estimated Offering Period	252,000,000
Decrease in Net Income due to Change in Estimated Offering Period		280,000,000
Increase in Diluted Earnings Per Share due to Change in Estimated Offering Period	0.88
Decrease in Diluted Earnings Per Share due to Change in Estimated Offering Period		$ 0.96
FY22 Change in Estimated Offering Period [Member]
Change in Accounting Estimate [Line Items]
Decrease in Net Revenue due to Change in Estimated Offering Period	131,000,000
Decrease in Net Income due to Change in Estimated Offering Period	100,000,000
Decrease in Diluted Earnings Per Share due to Change in Estimated Offering Period	$ 0.35
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%