Interest on Borrowings (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Interest Expense, Borrowings [Abstract]
Components of interest expense	Years Ended March 31,     2022   2021   2020     (In thousands) Interest expense $ 167,618 $ 165,484 $ 180,444 Capitalized interest   (9,700)   (11,573)   (23,517) Amortization of transaction costs   5,556   5,949   4,427 Interest expense resulting from cash flow hedges   3,950   3,642   (404) Total interest expense  167,424   163,502   160,950
Interest rates and company borrowings	Revolving Credit Activity       Years Ended March 31,       2022   2021   2020       (In thousands, except interest rates)   Weighted average interest rate during the year   1.40 % 1.40 % 3.31 % Interest rate at year end   1.49 % 1.40 % 2.86 % Maximum amount outstanding during the year $ 1,105,000 $ 1,175,000 $ 1,086,000   Average amount outstanding during the year $ 1,085,074 $ 1,088,293 $ 1,002,081   Facility fees$ 253 $ 261 $ 193