Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6877327&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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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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FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Debt Not Carried at Fair Value (Details) $ in Thousands	Oct. 01, 2015 EUR (€)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate (as a percent)		4.625%	4.625%
5.000% Notes due February 2023
Other financial instruments
Debt instrument interest rate (as a percent)		5.00%	5.00%
4.750% Notes due June 2025
Other financial instruments
Debt instrument interest rate (as a percent)		4.75%	4.75%
Level 1 \| 4.625% Notes due February 2020
Other financial instruments
Debt instrument interest rate (as a percent)		4.625%	4.625%
Level 1 \| 5.000% Notes due February 2023
Other financial instruments
Debt instrument interest rate (as a percent)		5.00%	5.00%
Level 1 \| 4.750% Notes due June 2025
Other financial instruments
Debt instrument interest rate (as a percent)		4.75%	4.75%
Carrying Amount
Other financial instruments
Fair Value		$ 2,690,782	$ 2,720,589
Carrying Amount \| Level 1 \| Term Loan, including current portion, due in installments through August 2018
Other financial instruments
Fair Value		570,000	577,500
Carrying Amount \| Level 1 \| Term Loan, including current portion, due in installments through March 2019
Other financial instruments
Fair Value		525,000	547,500
Carrying Amount \| Level 1 \| 4.625% Notes due February 2020
Other financial instruments
Fair Value		500,000	500,000
Carrying Amount \| Level 1 \| 5.000% Notes due February 2023
Other financial instruments
Fair Value		500,000	500,000
Carrying Amount \| Level 1 \| 4.750% Notes due June 2025
Other financial instruments
Fair Value		595,782	595,589
Fair Value
Other financial instruments
Fair Value		2,813,878	2,753,403
Fair Value \| Level 1 \| Term Loan, including current portion, due in installments through August 2018
Other financial instruments
Fair Value		568,222	573,533
Fair Value \| Level 1 \| Term Loan, including current portion, due in installments through March 2019
Other financial instruments
Fair Value		520,406	542,709
Fair Value \| Level 1 \| 4.625% Notes due February 2020
Other financial instruments
Fair Value		536,250	524,735
Fair Value \| Level 1 \| 5.000% Notes due February 2023
Other financial instruments
Fair Value		550,000	507,500
Fair Value \| Level 1 \| 4.750% Notes due June 2025
Other financial instruments
Fair Value		639,000	$ 604,926
Mirror Controls International
Other financial instruments
Debt instrument, face amount	€ 50,000,000	$ 56,100
Term of debt instrument	5 years