FAIR VALUE DISCLOSURES - Assets At Fair Value On A Recurring and Non Recurring Basis (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of inventories	$ 0	$ (9,276,000)	$ 0	$ (9,276,000)
Impairment of property and equipment	(42,022,000)	(104,939,000)	(42,022,000)	(104,939,000)
Impairment of investment in unconsolidated affiliates	(2,575,000)	0	(2,575,000)	0
Impairment of intangible assets	0	(3,005,000)	0	(3,005,000)
Impairment of goodwill	(17,504,000)	0	(17,504,000)	0
Loss on impairment	(62,101,000)	(117,220,000)	(62,101,000)	(117,220,000)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	3,443,000		3,443,000		$ 1,845,000
Rabbi Trust investments	2,645,000		2,645,000		2,544,000
Total assets	6,088,000		6,088,000		4,389,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0		0		0
Rabbi Trust investments	2,645,000		2,645,000		2,544,000
Total assets	2,645,000		2,645,000		2,544,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	3,443,000		3,443,000		1,845,000
Rabbi Trust investments	0		0		0
Total assets	3,443,000		3,443,000		1,845,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0		0		0
Rabbi Trust investments	0		0		0
Total assets	0		0		$ 0
Fair Value, Measurement, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventory, Noncurrent, Fair Value Disclosure		7,697,000		7,697,000
Property, Plant, and Equipment, Fair Value Disclosure	60,426,000	136,338,000	60,426,000	136,338,000
Equity Method Investments, Fair Value Disclosure	0		0
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		0		0
Goodwill, Fair Value Disclosure	0		0
Total assets	60,426,000	144,035,000	60,426,000	144,035,000
Fair Value, Measurement, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventory, Noncurrent, Fair Value Disclosure		0		0
Property, Plant, and Equipment, Fair Value Disclosure	0	0	0	0
Equity Method Investments, Fair Value Disclosure	0		0
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		0		0
Goodwill, Fair Value Disclosure	0		0
Total assets	0	0	0	0
Fair Value, Measurement, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventory, Noncurrent, Fair Value Disclosure		0		0
Property, Plant, and Equipment, Fair Value Disclosure	60,426,000	0	60,426,000	0
Equity Method Investments, Fair Value Disclosure	0		0
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		0		0
Goodwill, Fair Value Disclosure	0		0
Total assets	60,426,000	0	60,426,000	0
Fair Value, Measurement, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventory, Noncurrent, Fair Value Disclosure		7,697,000		7,697,000
Property, Plant, and Equipment, Fair Value Disclosure	0	136,338,000	0	136,338,000
Equity Method Investments, Fair Value Disclosure	0		0
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		0		0
Goodwill, Fair Value Disclosure	0		0
Total assets	$ 0	$ 144,035,000	$ 0	$ 144,035,000