Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 1) - Interest Rate Swap	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Variable rate received	0.00%	0.58%	1.05%	0.51%
Fixed rate paid	0.00%	0.94%	0.91%	0.94%