Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable To Parent [Abstract]
Interest expense	$ 42,128	$ 39,973	$ 122,174	$ 117,983
Decrease, fair value, cash flow hedges
AOCI Attributable To Parent [Abstract]
Interest expense			500
Reclassified AOCI
AOCI Attributable To Parent [Abstract]
Interest expense			2,700
Interest rate contracts
AOCI Attributable To Parent [Abstract]
Interest expense			$ 3,800