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Base principal amount per note.

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Number of common stock to be purchased.

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

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

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The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument.

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Indebtedness (Details Textual)	1 Months Ended			3 Months Ended		12 Months Ended
Indebtedness (Details Textual)	Mar. 31, 2020 USD ($) d $ / shares shares	Feb. 29, 2020 USD ($)	Mar. 31, 2016 USD ($) d $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible debt, net of issuance costs				$ 437,686,000
Cash proceeds from the sale of warrants				47,070,000
Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 550,000,000.0
Credit facility, expiration date		2025-02
Loan outstanding	$ 0			$ 0			$ 0
Revolving Senior Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		0.50%
Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		1.00%
Multicurrency Borrowings [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 250,000,000.0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		50,000,000.0
Swing Line Loans [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 5,000,000.0
2025 Warrants [Member]
Debt Instrument [Line Items]
Cash proceeds from the sale of warrants	$ 47,100,000
Warrant strike price \| $ / shares	$ 127.84			$ 127.84
2021 Warrants [Member]
Debt Instrument [Line Items]
Cash proceeds from the sale of warrants			$ 44,900,000
Warrant strike price \| $ / shares			$ 80.00
2025 Hedge [Member]
Debt Instrument [Line Items]
Number of common stock to be purchased \| shares	4,823,910
Stock price \| $ / shares	$ 93.29			$ 93.29
Derivative, maturity date	Mar. 15, 2025
2021 Hedge [Member]
Debt Instrument [Line Items]
Number of common stock to be purchased \| shares			10,865,270
Stock price \| $ / shares			$ 59.82
Derivative, maturity date			Mar. 15, 2021
Minimum [Member] \| Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Unused line fee		0.20%
Minimum [Member] \| Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		1.00%
Minimum [Member] \| Revolving Senior Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		0.00%
Minimum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year	2025-06
Minimum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year			2021-06
Maximum [Member] \| Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Unused line fee		0.35%
Maximum [Member] \| Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		1.75%
Maximum [Member] \| Revolving Senior Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate		0.75%
Maximum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year	2025-10
Maximum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year			2021-12
Additional Paid-in Capital [Member] \| 2025 Hedge [Member]
Debt Instrument [Line Items]
Cost of hedge transaction	$ 78,300,000			$ 78,300,000
Additional Paid-in Capital [Member] \| 2021 Hedge [Member]
Debt Instrument [Line Items]
Cost of hedge transaction						$ 111,200,000
Common Stock [Member] \| Maximum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Number of preferred or common stock into which the warrants is converted \| shares	4,823,910			4,823,910
Common Stock [Member] \| Maximum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Number of preferred or common stock into which the warrants is converted \| shares			10,865,270
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount	$ 450,000,000			$ 450,000,000
Proceeds from issuance of convertible debt, net of issuance costs	$ 437,700,000
Interest rate on convertible notes	0.375%			0.375%
Debt instrument, maturity date	Mar. 15, 2025
Initial conversion rate adjustment, shares	10.7198
Principal amount of debt considered for conversion rate	$ 1,000
Initial conversion price of convertible notes \| $ / shares	$ 93.29			$ 93.29
Contractual coupon interest expense				$ 100,000
Amortization of debt discount (premium)				1,200,000
Amortization of debt issuance costs				$ 100,000
Effective interest rate	4.90%			4.90%
Percentage of conversion price	130.00%
Debt redemption price percentage	100.00%
Principal payments due	$ 0			$ 0
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Scenario Two [Member]
Debt Instrument [Line Items]
Principal amount of debt considered for conversion rate	$ 1,000
Consecutive trading days considered for debt conversion \| d	5
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	20
Percentage of conversion price	130.00%
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Minimum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	20
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	30
Percentage of conversion price	98.00%
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Maximum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	30
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity				78,300,000
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	$ 650,000,000		$ 650,000,000.0	$ 650,000,000			$ 650,000,000
Proceeds from issuance of convertible debt, net of issuance costs			$ 634,100,000
Interest rate on convertible notes	2.25%		2.25%	2.25%			2.25%
Debt instrument, maturity date			Mar. 15, 2021
Initial conversion rate adjustment, shares			16.7158
Principal amount of debt considered for conversion rate			$ 1,000
Initial conversion price of convertible notes \| $ / shares			$ 59.82
Contractual coupon interest expense				$ 3,700,000	$ 3,700,000
Amortization of debt discount (premium)				4,500,000	4,300,000
Amortization of debt issuance costs				$ 800,000	$ 800,000
Effective interest rate	5.80%			5.80%
Debt redemption price percentage			100.00%
Principal payments due	$ 0			$ 0
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Scenario Two [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d			5
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of conversion price			130.00%
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Minimum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d			20
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of conversion price			98.00%
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Maximum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d			30
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity						$ 84,800,000