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Uncommitted revolving credit facilities lines of credit and other loans.

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

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

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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.

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Amount of the required periodic payments including both interest and principal payments.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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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.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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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.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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BANK BORROWINGS AND LONG-TERM DEBT - Narrative (Details)			1 Months Ended						3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 30, 2016 EUR (€)	Jan. 31, 2017 EUR (€)	Nov. 30, 2016 USD ($)	Oct. 31, 2015 EUR (€)	Jun. 30, 2015 USD ($)	Jul. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Aug. 30, 2013 USD ($)
Bank borrowings and long-term debt
Proceeds from the notes offering										$ 1,366,000,000	$ 312,741,000	$ 884,702,000
Percentage of ownership interest owned in subsidiaries that guarantees indebtedness or is a borrower under the term loan agreement and revolving line of credit								100.00%
Long-term debt										$ 2,954,457,000
Credit Facility \| LIBOR
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										LIBOR
Credit Facility \| Prime rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										prime rate
Credit Facility \| Federal funds rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										federal funds rate
Credit Facility \| LIBOR for a one-month interest period
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										LIBOR for a one-month interest period
Credit Facility \| Prime rate, federal funds rate plus 0.50% and LIBOR for a one-month interest period plus 1.00%
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										base rate
Other Credit Lines
Bank borrowings and long-term debt
Uncommitted revolving credit facilities, lines of credit and other loans										$ 256,500,000
Borrowings outstanding										$ 0	0
Term Loan, including current portion, due in installments through August 2018
Bank borrowings and long-term debt
Long term loans payable													$ 600,000,000
Term Loan, including current portion, due in installments through August 2018 \| LIBOR
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										LIBOR
Term Loan, including current portion, due in installments through August 2018 \| LIBOR \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)				1.125%
Term Loan, including current portion, due in installments through August 2018 \| LIBOR \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)				2.125%
Term Loan, including current portion, due in installments through August 2018 \| Prime rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										prime rate
Term Loan, including current portion, due in installments through August 2018 \| Federal funds rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										federal funds rate
Term Loan, including current portion, due in installments through August 2018 \| LIBOR for a one-month interest period
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										LIBOR for a one-month interest period
Debt instrument, basis spread on variable rate (as a percent)				1.00%
Term Loan, including current portion, due in installments through August 2018 \| Prime rate, federal funds rate plus 0.50% and LIBOR for a one-month interest period plus 1.00%
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate										base rate
Term Loan, including current portion, due in installments through August 2018 \| Prime rate, federal funds rate plus 0.50% and LIBOR for a one-month interest period plus 1.00% \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)				0.125%
Term Loan, including current portion, due in installments through August 2018 \| Prime rate, federal funds rate plus 0.50% and LIBOR for a one-month interest period plus 1.00% \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)				1.125%
Term Loan, including current portion, due in installments through June 2022
Bank borrowings and long-term debt
Long term loans payable				$ 700,000,000
Proceeds from the notes offering				130,000,000
Principal payments due quarterly				$ 4,100,000
Long-term debt										$ 483,656,000	502,500,000
Term Loan, including current portion, due in installments through June 2022 \| Federal funds rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)				0.50%
4.625% Notes due February 2020
Bank borrowings and long-term debt
Debt instrument								$ 500,000,000.0
Debt instrument interest rate								4.625%		4.625%
Long-term debt										$ 500,000,000	500,000,000
5.000% Notes due February 2023
Bank borrowings and long-term debt
Debt instrument								$ 500,000,000.0
Debt instrument interest rate								5.00%		5.00%
Long-term debt										$ 500,000,000	$ 500,000,000
Notes due 2020 and 2023
Bank borrowings and long-term debt
Proceeds from the notes offering							$ 990,600,000
Cash on hand used to repay debt							9,400,000
Redemption price as a percentage of principal amount								100.00%
Notes due 2020 and 2023 \| Minimum
Bank borrowings and long-term debt
Percentage of principal amount of the then outstanding Notes due and payable								25.00%
Term Loan Agreement
Bank borrowings and long-term debt
Repay outstanding borrowings							$ 1,000,000,000
Percentage of Notes principal that may be redeemed upon occurrence of a change of control repurchase event								101.00%
Term Loan Agreement Including Current Portion Due In Installments Through June 2025
Bank borrowings and long-term debt
Debt instrument						$ 600,000,000
Debt instrument interest rate						4.75%
Percentage of ownership interest owned in subsidiaries that guarantees indebtedness or is a borrower under the term loan agreement and revolving line of credit						100.00%
Redemption price as a percentage of principal amount						100.00%
Redemption price percentage						99.213%
Effective interest rate						4.85%
Long-term debt						$ 595,300,000
Debt issuance cost						$ 7,900,000
Percentage of debt redeemable upon occurrence of change of control repurchase event						101.00%
Term Loan Agreement Including Current Portion Due In Installments Through June 2025 \| Minimum
Bank borrowings and long-term debt
Percentage of principal amount of the then outstanding Notes due and payable						25.00%
Term Loan Agreement Due January 2022 \| Other Credit Lines
Bank borrowings and long-term debt
Debt instrument term			5 years
Debt instrument			€ 100,000,000							123,500,000.0
Term Loan Agreement Due January 2022 \| Other Credit Lines \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)			0.40%
Term Loan Agreement Due January 2022 \| Other Credit Lines \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)			1.35%
2022 Credit Facility
Bank borrowings and long-term debt
Debt instrument term	5 years
Periodic payment	$ 6,300,000
Future periodic payment	$ 12,600,000
2022 Credit Facility \| Federal funds rate
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	0.50%
2022 Credit Facility \| LIBOR for a one-month interest period
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	1.00%
2022 Credit Facility \| Outstanding under revolving line of credit
Bank borrowings and long-term debt
Borrowing capacity	$ 1,750,000,000								$ 1,750,000,000
2022 Credit Facility \| Term Loan
Bank borrowings and long-term debt
Borrowing capacity	$ 502,500,000								502,500,000
4.625% Notes due February 2020
Bank borrowings and long-term debt
Extinguishment of debt									$ 2,100,000,000	2,100,000,000
Mirror Controls International
Bank borrowings and long-term debt
Principal payments due quarterly \| €		€ 312,500
Debt instrument term					5 years
Debt instrument					€ 50,000,000					$ 61,800,000.0
Mirror Controls International \| Euribor Future \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)					0.80%
Mirror Controls International \| Euribor Future \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)					2.00%
External Credit Rating, Investment Grade \| 2022 Credit Facility \| Federal funds rate \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	0.125%
External Credit Rating, Investment Grade \| 2022 Credit Facility \| Federal funds rate \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	0.875%
External Credit Rating, Investment Grade \| 2022 Credit Facility \| LIBOR for a one-month interest period \| Minimum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	1.125%
External Credit Rating, Investment Grade \| 2022 Credit Facility \| LIBOR for a one-month interest period \| Maximum
Bank borrowings and long-term debt
Debt instrument, basis spread on variable rate (as a percent)	1.875%