OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Immaterial Corrections to Prior Period Financial Information (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-term debt, less current maturities	$ 11,096,000	$ 1,150,956,000
Accrued wages, benefits and related taxes	67,334,000	64,026,000
Retained earnings	788,834,000	986,957,000	$ 1,167,324,000	$ 1,279,493,000
Stockholders' Equity Attributable to Parent	1,170,891,000	1,284,258,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,178,144,000	1,289,283,000	1,504,943,000	1,613,837,000
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accrued wages, benefits and related taxes	62,385,000	59,077,000
Retained earnings	793,783,000	991,906,000	1,172,273,000	1,284,442,000
Stockholders' Equity Attributable to Parent	1,175,840,000	1,289,207,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,183,093,000	1,294,232,000
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Long-term debt, less current maturities	(1,400,000,000)
Accrued wages, benefits and related taxes	4,949,000	4,949,000
Retained earnings	(4,949,000)	(4,949,000)	(4,949,000)	(4,949,000)
Stockholders' Equity Attributable to Parent	(4,949,000)	(4,949,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (4,949,000)	$ (4,949,000)	$ (4,949,000)	$ (4,949,000)