Consolidated Balance Sheets - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 3,822	$ 4,829
Accounts receivable-trade, net of allowance for expected credit losses of $2,626 and $2,192, respectively	1,123,163	725,943
Accounts receivable-affiliates	8,591	9,435
Inventories	251,277	158,467
Prepaid expenses and other current assets	159,486	109,164
Total current assets	1,546,339	1,007,838
PROPERTY, PLANT AND EQUIPMENT, net of accumulated depreciation of $887,006 and $776,279, respectively	2,462,390	2,706,853
PROPERTY, PLANT AND EQUIPMENT, accumulated depreciation	(887,006)	(776,279)
GOODWILL	744,439	744,439
INTANGIBLE ASSETS, net of accumulated amortization of $507,285 and $517,518, respectively	1,135,354	1,262,613
INTANGIBLE ASSETS, accumulated amortization	(507,285)	(517,518)
INVESTMENTS IN UNCONSOLIDATED ENTITIES	21,897	22,719
OPERATING LEASE RIGHT-OF-USE ASSETS	114,124	152,146
OTHER NONCURRENT ASSETS	45,802	50,733
Total assets	6,070,345	5,947,341
CURRENT LIABILITIES:
Accounts payable-trade	1,084,837	679,868
Accounts payable-affiliates	73	119
Accrued expenses and other payables	140,719	170,400
Advance payments received from customers	7,934	11,163
Current maturities of long-term debt	2,378	2,183
Operating lease obligations	41,261	47,070
Total current liabilities	1,277,202	910,803
LONG-TERM DEBT, net of debt issuance costs of $42,988 and $55,555, respectively, and current maturities	3,350,463	3,319,030
Debt issuance costs, noncurrent, net	(42,988)	(55,555)
OPERATING LEASE OBLIGATIONS	72,784	103,637
OTHER NONCURRENT LIABILITIES	104,346	114,615
COMMITMENTS AND CONTINGENCIES (NOTE 8)
EQUITY:
General partner, representing a 0.1% interest, 130,827 and 129,724 notional units, respectively	(52,478)	(52,189)
Limited partners, representing a 99.9% interest, 130,695,970 and 129,593,939 common units issued and outstanding, respectively	401,486	582,784
Accumulated other comprehensive loss	(308)	(266)
Noncontrolling interests	17,394	69,471
Total equity	714,453	948,159
Total liabilities and equity	6,070,345	5,947,341
Series D Preferred Stock
CURRENT LIABILITIES:
CLASS D 9.00% PREFERRED UNITS, 600,000 and 600,000 preferred units issued and outstanding, respectively	$ 551,097	$ 551,097
Preferred units dividend rate	9.00%
Temporary equity, issued and outstanding (in units)	600,000	600,000
Series B Preferred Stock
EQUITY:
Preferred limited partners	$ 305,468	$ 305,468
Preferred units, issued and outstanding (in units)	12,585,642	12,585,642
Series C Preferred Stock
EQUITY:
Preferred limited partners	$ 42,891	$ 42,891
Preferred units, issued and outstanding (in units)	1,800,000	1,800,000
General Partner
EQUITY:
General partner interest	0.10%
General partner, notional units outstanding (in units)	130,827	129,724
Limited Partner
EQUITY:
Limited partner interest	99.90%
Limited partners, common units issued and outstanding (in units)	130,695,970	129,593,939
Trade Accounts Receivable
CURRENT ASSETS:
Accounts receivable - trade, allowance for expected credit loss	$ 2,626	$ 2,192