Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Sep. 30, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 1,560,000	$ 1,745,000
Less: unamortized debt costs	(11,900)	(14,700)
Long-term debt, net	1,548,100	1,730,300
2012 ABL Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 0	55,000
Senior Notes \| 2016 Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.375%
Total long-term debt (including current portion)	$ 600,000	600,000
Senior Notes \| 2019 Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.125%
Total long-term debt (including current portion)	$ 400,000	400,000
Term B-5 Loans \| 2012 Senior Notes
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 560,000	$ 690,000
Term B-5 Loans \| 2012 Senior Notes \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Debt instrument, variable rate, minimum	0.00%
Term B-5 Loans \| 2012 Senior Notes \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Debt instrument, variable rate, minimum	1.00%

Debt Instrument, Variable Rate, Minimum

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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