Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The price per share of the conversion feature embedded in the debt instrument.

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The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)	1 Months Ended	3 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)	Jan. 31, 2018 USD ($) shares $ / shares	Mar. 31, 2019 USD ($)	Apr. 01, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jan. 01, 2018 shares
Derivative [Line Items]
Proceeds from sale of warrants	$ 18,100,000	$ 0	$ 18,147,000
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative amount				$ 200,000,000.0
Convertible Senior Notes Due 2023 [Member] \| Convertible Debt [Member]
Derivative [Line Items]
Debt conversion shares issued if converted (in shares) \| shares	1,962,790
Debt conversion price (in dollars per share) \| $ / shares	$ 87.89
Shares issued under warrant (in shares) \| shares					1,962,790
Initial warrant strike price (in dollars per share) \| $ / shares	$ 113.93
Designated as Hedging Instrument [Member] \| Convertible Debt Contract [Member]
Derivative [Line Items]
Payments for derivatives	$ 31,500,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative amount		$ 200,000,000.0