SEGMENT INFORMATION: Total operating segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gross Profit	$ 118,951	$ 106,844	$ 327,673	$ 295,988
Operating Income (Loss)	11,058	9,115	5,804	24,397
Gains, losses and other items, net		2,111	3,521	2,724
Operating Segments
Segment Reporting Information [Line Items]
Gross Profit	126,533	113,705	350,558	312,979
Operating Income (Loss)	61,983	57,576	167,347	154,580
Segment Reconciling Items
Segment Reporting Information [Line Items]
Purchased intangible asset amortization	5,971	4,621	17,958	12,588
Non-cash stock compensation	1,611	2,240	4,927	4,403
Corporate expenses (principally general and administrative)	23,862	24,184	75,582	75,342
Separation and transformation costs included in general and administrative	5,214	4,118	17,775	5,573
Gains, losses and other items, net	(41)	2,111	3,521	2,725
Purchased intangible asset amortization	5,971	4,621	17,958	12,588
Non-cash stock compensation	$ 15,919	$ 13,427	$ 46,707	$ 33,955