Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2021	Mar. 31, 2021
Cash and cash equivalents	$ 5,456	$ 4,829
Accounts receivable-trade, net of allowance for expected credit losses of $2,227 and $2,192, respectively	1,042,641	725,943
Accounts receivable-affiliates	8,824	9,435
Inventories	333,923	158,467
Prepaid expenses and other current assets	131,696	109,164
Total current assets	1,522,540	1,007,838
PROPERTY, PLANT AND EQUIPMENT, net of accumulated depreciation of $887,840 and $776,279, respectively	2,483,876	2,706,853
GOODWILL	744,439	744,439
INTANGIBLE ASSETS, net of accumulated amortization of $546,221 and $517,518, respectively	1,152,198	1,262,613
INVESTMENTS IN UNCONSOLIDATED ENTITIES	21,263	22,719
OPERATING LEASE RIGHT-OF-USE ASSETS	122,976	152,146
OTHER NONCURRENT ASSETS	47,479	50,733
Total assets	6,094,771	5,947,341
Accounts payable-trade	973,471	679,868
Accounts payable-affiliates	260	119
Accrued expenses and other payables	165,031	170,400
Advance payments received from customers	16,240	11,163
Current maturities of long-term debt	2,328	2,183
Operating lease obligations	43,822	47,070
Total current liabilities	1,201,152	910,803
LONG-TERM DEBT, net of debt issuance costs of $46,156 and $55,555, respectively, and current maturities	3,411,757	3,319,030
OPERATING LEASE OBLIGATIONS	78,628	103,637
OTHER NONCURRENT LIABILITIES	108,422	114,615
COMMITMENTS AND CONTINGENCIES (NOTE 7)
General partner, representing a 0.1% interest, 130,114 and 129,724 notional units, respectively	(52,422)	(52,189)
Limited partners, representing a 99.9% interest, 129,984,138 and 129,593,939 common units issued and outstanding, respectively	430,358	582,784
Accumulated other comprehensive loss	(314)	(266)
Noncontrolling interests	17,734	69,471
Total equity	743,715	948,159
Total liabilities and equity	6,094,771	5,947,341
PROPERTY, PLANT AND EQUIPMENT, accumulated depreciation	(887,840)	(776,279)
INTANGIBLE ASSETS, accumulated amortization	(546,221)	(517,518)
Debt issuance costs, noncurrent, net	(46,156)	(55,555)
Series D Preferred Stock
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
Preferred limited partners	$ 305,468	$ 305,468
Preferred units, issued and outstanding (in units)	12,585,642	12,585,642
Series C Preferred Stock
Preferred limited partners	$ 42,891	$ 42,891
Preferred units, issued and outstanding (in units)	1,800,000	1,800,000
General Partner
General partner interest	0.10%
General partner, notional units outstanding (in units)	130,114	129,724
Limited Partner
Limited partner interest	99.90%
Limited partners, common units issued and outstanding (in units)	129,984,138	129,593,939
Trade Accounts Receivable
Accounts receivable-trade, allowance for expected credit loss	$ 2,227	$ 2,192