Represents the floor for the reference rate used to compute the variable rate on the debt instrument.

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Represents the fixed charge coverage ratio relating to the debt agreement.

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Represents the number of days for extensions on customary terms relating to escrow notes issued by the entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Represents the number of days threshold relating to the debt threshold per the debt agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the threshold amount allowed to be outstanding per the debt agreement.

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Represents the threshold amount of availability on the revolving credit facility, below which the entity is required to maintain a specified minimum fixed charge coverage ratio per the covenant terms.

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Represents the threshold amount of debt per the agreement.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in and after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Number of second priority secured term loan facilities.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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 number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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

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Face (par) amount of the original debt instrument that was repurchased.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Weighted average interest rate of debt outstanding.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Gross amount of debt extinguished.

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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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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Indebtedness and Credit Agreement (Details) shares in Thousands, $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 15, 2015 USD ($)	Oct. 15, 2014 USD ($)	May 30, 2015 USD ($) shares	Aug. 29, 2015 USD ($)	Mar. 04, 2017 USD ($) loan	Feb. 27, 2016 USD ($)	Feb. 28, 2015 USD ($)	Apr. 02, 2015 USD ($)	Jan. 15, 2015 USD ($)
Indebtedness and credit agreements
Lease financing obligations					$ 65,315	$ 79,653
Total debt					7,328,693	6,994,136
Current maturities of long-term debt and lease financing obligations					(21,335)	(26,848)
Long-term debt and lease financing obligations, less current maturities					$ 7,307,358	6,967,288
Loss on debt retirements, net				$ 33,205		$ 33,205	$ 18,512
Credit facility
Number of second priority secured term loan facilities \| loan					2
Ownership interest (as a percent)					100.00%
Interest Rates and Maturities
Annual weighted average rate (as a percent)					5.40%	5.40%	5.80%
Maturities
2018					$ 90
2019					0
2010					2,430,000
2021					1,372,000
2022 and thereafter					3,533,000
Senior secured credit facility
Indebtedness and credit agreements
Long-term debt					3,368,574	$ 3,027,766
Senior secured revolving credit facility due January 2020
Indebtedness and credit agreements
Long-term debt					2,405,082	2,066,097
Principal amount of debt					2,430,000	2,100,000
Unamortized debt issuance costs					24,918	33,903
Credit facility
Maximum borrowing capacity					3,000,000				$ 3,700,000
Outstanding borrowings					2,430,000
Letters of credit outstanding					62,272
Additional borrowing capacity					1,207,728
Amount of debt allowed to be outstanding					1,500,000
Threshold amount of debt					$ 750,000
Number of days relating to debt threshold					90 days
Period allowed for extensions on customary terms					90 days
Availability under revolving credit facility					$ 1,207,728
Senior secured revolving credit facility due January 2020 \| Minimum
Credit facility
Percentage of fee payable on daily unused revolver availability					0.25%
Additional borrowing capacity					$ 365,000
Threshold availability on the thirtieth consecutive calendar day					$ 250,000
Fixed charge coverage ratio					1.00
Senior secured revolving credit facility due January 2020 \| Maximum
Credit facility
Percentage of fee payable on daily unused revolver availability					0.375%
Threshold availability on revolving credit facility to trigger fixed charge coverage requirements					$ 200,000
Threshold availability on the third consecutive business day					$ 250,000
Senior secured revolving credit facility due January 2020 \| LIBOR \| Minimum
Credit facility
Percentage points added to the reference rate					1.50%
Senior secured revolving credit facility due January 2020 \| LIBOR \| Maximum
Credit facility
Percentage points added to the reference rate					2.00%
Senior secured revolving credit facility due January 2020 \| Alternate base rate \| Minimum
Credit facility
Percentage points added to the reference rate					0.50%
Senior secured revolving credit facility due January 2020 \| Alternate base rate \| Maximum
Credit facility
Percentage points added to the reference rate					1.00%
8.00% senior secured notes (senior lien) due August 2020
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)	8.00%			8.00%
Notes redeemed and discharged	$ 650,000
Loss on debt retirements, net				$ 33,205
Tranche 1 Term Loan (second lien) due August 2020
Indebtedness and credit agreements
Long-term debt					$ 465,833	464,586
Principal amount of debt					470,000	470,000
Unamortized debt issuance costs					$ 4,167	5,414
Tranche 1 Term Loan (second lien) due August 2020 \| LIBOR
Credit facility
Percentage points added to the reference rate					4.75%
LIBOR floor (as a percent)					1.00%
Tranche 1 Term Loan (second lien) due August 2020 \| Citibank's base rate
Credit facility
Percentage points added to the reference rate					3.75%
Tranche 2 Term Loan (second lien) due June 2021
Indebtedness and credit agreements
Long-term debt					$ 497,569	496,993
Principal amount of debt					500,000	500,000
Unamortized debt issuance costs					$ 2,431	3,007
Tranche 2 Term Loan (second lien) due June 2021 \| LIBOR
Credit facility
Percentage points added to the reference rate					3.875%
LIBOR floor (as a percent)					1.00%
Tranche 2 Term Loan (second lien) due June 2021 \| Citibank's base rate
Credit facility
Percentage points added to the reference rate					2.875%
10.25% senior secured notes (second lien) due October 2019
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)		10.25%
Loss on debt retirements, net		$ 18,512
Credit facility
Early redemption of debt		$ 270,000
Redemption price		105.125%
Other secured
Indebtedness and credit agreements
Long-term debt					$ 90	90
Guaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt					3,474,200	3,466,348
9.25% senior notes due March 2020
Indebtedness and credit agreements
Long-term debt					$ 896,544	$ 894,563
Debt instrument, stated interest rate (as a percent)					9.25%	9.25%
Principal amount of debt					$ 902,000	$ 902,000
Unamortized debt issuance costs					7,527	10,180
Unamortized premium					2,071	2,743
6.75% senior notes due June 2021
Indebtedness and credit agreements
Long-term debt					$ 803,640	$ 802,128
Debt instrument, stated interest rate (as a percent)					6.75%	6.75%
Principal amount of debt					$ 810,000	$ 810,000
Unamortized debt issuance costs					6,360	7,872
6.125% senior notes due 2023
Indebtedness and credit agreements
Long-term debt					$ 1,774,016	$ 1,769,657
Debt instrument, stated interest rate (as a percent)					6.125%	6.125%
Principal amount of debt					$ 1,800,000	$ 1,800,000
Unamortized debt issuance costs					25,984	30,343
6.125% senior notes due 2023 \| EnvisionRx
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)								6.125%
Principal amount of debt								$ 1,800,000
Unguaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt					420,604	420,369
8.5% convertible notes due May 2015
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)			8.50%
Convertible notes amount			$ 64,089
Shares issued for EnvisionRx acquisition (in shares) \| shares			24,762
Face amount of debt repurchased			$ 79
7.7% notes due February 2027
Indebtedness and credit agreements
Long-term debt					$ 293,375	$ 293,206
Debt instrument, stated interest rate (as a percent)					7.70%	7.70%
Principal amount of debt					$ 295,000	$ 295,000
Unamortized debt issuance costs					1,625	1,794
6.875% fixed-rate senior notes due December 2028
Indebtedness and credit agreements
Long-term debt					$ 127,229	$ 127,163
Debt instrument, stated interest rate (as a percent)					6.875%	6.875%
Principal amount of debt					$ 128,000	$ 128,000
Unamortized debt issuance costs					$ 771	$ 837