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Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of finite-lived intangible assets

Our intangible assets consist of the following at the dates indicated:
 
 
 
 
 
March 31, 2019
 
March 31, 2018
Description
Amortizable
Lives
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
(in years)
 
(in thousands)
Amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
3
-
30
 
$
742,832

 
$
(369,983
)
 
$
372,849

 
$
718,764

 
$
(328,666
)
 
$
390,098

Customer commitments
10
 
 
 
310,000

 
(74,917
)
 
235,083

 
310,000

 
(43,917
)
 
266,083

Pipeline capacity rights
30
 
 
 
7,799

 
(1,387
)
 
6,412

 
7,799

 
(1,127
)
 
6,672

Rights-of-way and easements
1
-
40
 
73,409

 
(4,509
)
 
68,900

 
63,995

 
(3,214
)
 
60,781

Water rights
14
 
 
 
64,868

 
(3,018
)
 
61,850

 
—

 
—

 
—

Executory contracts and other agreements
3
-
30
 
47,230

 
(17,212
)
 
30,018

 
42,919

 
(15,424
)
 
27,495

Non-compete agreements
2
-
32
 
12,723

 
(2,570
)
 
10,153

 
5,465

 
(706
)
 
4,759

Debt issuance costs (1)
5
 
 
 
42,345

 
(29,521
)
 
12,824

 
40,992

 
(24,593
)
 
16,399

Total amortizable
 
 
 
 
1,301,206

 
(503,117
)
 
798,089

 
1,189,934

 
(417,647
)
 
772,287

Non-amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trade names
 
 
 
 
2,800

 
—

 
2,800

 
2,800

 
—

 
2,800

Total
 
 
 
 
$
1,304,006

 
$
(503,117
)
 
$
800,889

 
$
1,192,734

 
$
(417,647
)
 
$
775,087


(1)
Includes debt issuance costs related to the Revolving Credit Facility (as defined herein). Debt issuance costs related to fixed-rate notes are reported as a reduction of the carrying amount of long-term debt.

Amounts in the table above do not include intangible assets and accumulated amortization related to TPSL, as these amounts have been classified as noncurrent assets held for sale within our March 31, 2019 and 2018 consolidated balance sheets (see Note 1 and Note 17). In addition, amounts in the table above do not include intangible assets and accumulated amortization related to our former Retail Propane segment, as these amounts have been classified as noncurrent assets held for sale within our March 31, 2018 consolidated balance sheet (see Note 1 and Note 17).
Schedule of indefinite-lived intangible assets

Our intangible assets consist of the following at the dates indicated:
 
 
 
 
 
March 31, 2019
 
March 31, 2018
Description
Amortizable
Lives
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
 
(in years)
 
(in thousands)
Amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
3
-
30
 
$
742,832

 
$
(369,983
)
 
$
372,849

 
$
718,764

 
$
(328,666
)
 
$
390,098

Customer commitments
10
 
 
 
310,000

 
(74,917
)
 
235,083

 
310,000

 
(43,917
)
 
266,083

Pipeline capacity rights
30
 
 
 
7,799

 
(1,387
)
 
6,412

 
7,799

 
(1,127
)
 
6,672

Rights-of-way and easements
1
-
40
 
73,409

 
(4,509
)
 
68,900

 
63,995

 
(3,214
)
 
60,781

Water rights
14
 
 
 
64,868

 
(3,018
)
 
61,850

 
—

 
—

 
—

Executory contracts and other agreements
3
-
30
 
47,230

 
(17,212
)
 
30,018

 
42,919

 
(15,424
)
 
27,495

Non-compete agreements
2
-
32
 
12,723

 
(2,570
)
 
10,153

 
5,465

 
(706
)
 
4,759

Debt issuance costs (1)
5
 
 
 
42,345

 
(29,521
)
 
12,824

 
40,992

 
(24,593
)
 
16,399

Total amortizable
 
 
 
 
1,301,206

 
(503,117
)
 
798,089

 
1,189,934

 
(417,647
)
 
772,287

Non-amortizable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trade names
 
 
 
 
2,800

 
—

 
2,800

 
2,800

 
—

 
2,800

Total
 
 
 
 
$
1,304,006

 
$
(503,117
)
 
$
800,889

 
$
1,192,734

 
$
(417,647
)
 
$
775,087


(1)
Includes debt issuance costs related to the Revolving Credit Facility (as defined herein). Debt issuance costs related to fixed-rate notes are reported as a reduction of the carrying amount of long-term debt.

Amounts in the table above do not include intangible assets and accumulated amortization related to TPSL, as these amounts have been classified as noncurrent assets held for sale within our March 31, 2019 and 2018 consolidated balance sheets (see Note 1 and Note 17). In addition, amounts in the table above do not include intangible assets and accumulated amortization related to our former Retail Propane segment, as these amounts have been classified as noncurrent assets held for sale within our March 31, 2018 consolidated balance sheet (see Note 1 and Note 17).
Schedule of amortization expense
Amortization expense is as follows for the periods indicated:
 
 
Year Ended March 31,
Recorded In
 
2019
 
2018
 
2017
 
 
(in thousands)
Depreciation and amortization
 
$
110,458

 
$
108,444

 
$
89,765

Cost of sales
 
486

 
966

 
1,994

Interest expense
 
4,928

 
4,568

 
4,471

Total
 
$
115,872

 
$
113,978

 
$
96,230



Amounts in the table above do not include amortization expense related to TPSL and our former Retail Propane segment, as these amounts have been classified as discontinued operations within our consolidated statements of operations for all periods presented (see Note 1 and Note 17).
Schedule of expected amortization of intangible assets
Expected amortization of our intangible assets is as follows (in thousands):
Year Ending March 31,
 

2020
$
116,626

2021
104,512

2022
91,674

2023
83,654

2024
77,514

Thereafter
324,109

Total
$
798,089