Description Of Business And Basis Of Presentation Fiscal Period (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Fiscal Period
Current and Prior Years Fiscal Period (in weeks)			52	52
Current and Prior Years Fiscal Quarter Period (in weeks)	13	13	39	39
Minimum
Fiscal Period
Fiscal Year			52
Maximum
Fiscal Period
Fiscal Year			53