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Represents the percentage of principal amount at which the entity may redeem the debt instrument in the fifth year.

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Represents the percentage of principal amount at which the entity may redeem the debt instrument with net cash proceeds of qualified equity offerings.

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Represents the maximum percentage of the original principal amount of the debt instruments that the entity may redeem with net cash proceeds of qualified equity offerings.

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Represents the percentage of principal amount at which the entity is obligated to offer to repurchase the debt instrument in the event of certain asset sales.

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Represents the percentage of principal amount at which the entity is obligated to offer to repurchase the debt instrument due to a change in control.

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Represents the percentage of principal amount at which the holder of the note may require the entity to repurchase the debt instrument.

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Represents the accordion feature to increase the maximum borrowing capacity under the credit facility.

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The proceeds received as a percentage of the original principal amount of the debt instrument.

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The increase during the period in capital lease obligations due to entering into new capital leases.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Gross amount of debt extinguished.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for loan and debt issuance costs.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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LONG-TERM DEBT (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Long-term debt
Payments of Financing Costs				$ 171	$ 5,859
Average price of common stock (in dollars per share)					$ 66.71
Additional number of shares included in diluted earning per share calculation (in shares)	0	0		0	57
Long-term debt	$ 1,680,954			$ 1,680,954		$ 1,368,600
Unamortized Debt Issuance Expense	(9,430)			(9,430)		(10,796)
Revolving credit facility
Long-term debt
Line of Credit Facility, Maximum Borrowing Capacity	1,000,000			1,000,000
Line of Credit Facility, Accordion Feature	250,000			250,000
Payments of Financing Costs		$ 2,795
Long-term debt	393,704			393,704		148,255
Secured Debt [Member]
Long-term debt
Derivative Asset, Fair Value, Gross Liability	1,342			1,342		(2,743)
Long-term debt	342,188			342,188		356,250
Asset-backed Securities [Member]
Long-term debt
Line of Credit Facility, Maximum Borrowing Capacity	225,000			225,000		175,000
Payments of Financing Costs	252
Long-term debt	191,000			191,000		100,000
Equipment leasing facility and other capital leases
Long-term debt
Long-term debt	80,514			80,514		91,913
Senior notes due 2018
Long-term debt
Debt instrument principal amount	$ 350,000			$ 350,000
Debt instrument interest rate stated percentage (as a percent)	8.63%			8.63%
Percentage of principal amount at which the entity may redeem the note before November 15, 2014 (as a percent)	104.79%
Gains (Losses) on Extinguishment of Debt		$ 22,615
Senior notes due 2021 [Member]
Long-term debt
Debt instrument principal amount						$ 375,000
Debt instrument interest rate stated percentage (as a percent)						4.875%
Proceeds from loan, percentage of principal (as a percent)	100.00%
Payments of Financing Costs			$ 6,327
Debt Instrument, Redemption with Net Proceeds from Equity Offerings as Percentage of Original Principal	35.00%
Effective interest yield on principal amount (as a percent)						4.875%
Debt Instrument, Repurchase Obligation Due to Change of Control, Percentage of Original Principal	101.00%
Asset sales redemption price, percentage of principal (as a percent)	100.00%
The limit of the principal amount of the debt instrument which the entity may redeem (as a percent)	104.875%
Long-term debt	$ 375,000			$ 375,000		$ 375,000
Senior Notes Due 2022 [Member]
Long-term debt
Debt instrument principal amount						$ 300,000
Debt instrument interest rate stated percentage (as a percent)						5.25%
Proceeds from loan, percentage of principal (as a percent)	100.00%
Payments of Financing Costs			$ 4,990
Debt Instrument, Redemption with Net Proceeds from Equity Offerings as Percentage of Original Principal	35.00%
Effective interest yield on principal amount (as a percent)						5.25%
Debt Instrument, Repurchase Obligation Due to Change of Control, Percentage of Original Principal	101.00%
Asset sales redemption price, percentage of principal (as a percent)	100.00%
The limit of the principal amount of the debt instrument which the entity may redeem (as a percent)	105.25%
Long-term debt	$ 300,000			$ 300,000		$ 300,000
Convertible senior subordinated notes
Long-term debt
Percentage of principal amount that the holder of the note may require the entity to repurchase the debt instrument on October 1, 2011, 2016, and 2021 (as a percent)	100.00%
Conversion price (in dollars per share)	$ 27.12			$ 27.12
Notes Payable, Other Payables [Member]
Long-term debt
Long-term debt	$ 7,978			$ 7,978		7,978
Debt Conversion, Redeemer [Member] \| Convertible senior subordinated notes
Long-term debt
Extinguishment of Debt, Amount				12,834
Reported Value Measurement [Member]
Long-term debt
Long-term debt	1,680,954			1,680,954		1,368,600
Estimate of Fair Value Measurement [Member]
Long-term debt
Long-term debt	$ 1,553,326			1,553,326		$ 1,358,306
Financed [Member]
Long-term debt
Capital lease obligations entered into to finance capital additions				13	$ 52
Existing Assets [Member]
Long-term debt
Capital lease obligations entered into to finance capital additions				$ 6,497	$ 28,860