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Financing (Unsecured Revolving Credit Facility) (Narrative) (Details) - Line of credit facility [Member] - Unsecured debt [Member] - USD ($) $ in Millions | 9 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Unsecured Revolving Credit Facility |  |
Credit agreement description | On April 5, 2017, the Company entered into a new credit agreement (the “Credit Agreement”). The new Credit Agreement provides for a $1.2 billion unsecured revolving credit facility (the “Revolving Credit Facility”) arranged by JPMorgan Chase Bank, N.A., which is scheduled to mature in April 2022. The new Credit Agreement includes a $200 million sub-limit for the issuance of letters of credit and a $75 million sub-limit for swing line borrowings under the Revolving Credit Facility. As described in the new Credit Agreement governing the Revolving Credit Facility, the Company may, from time to time, subject to certain conditions, increase the aggregate commitments under the Revolving Credit Facility by up to $600 million, provided that the aggregate amount of the commitments does not exceed $1.8 billion at any time. |
Credit agreement inception date | Apr. 05, 2017 |
Current maximum borrowing capacity under credit facility | $ 1,200.0 |
Line of credit facility expiration date | Apr. 05, 2022 |
Maximum aggregate increase to credit facility allowable | $ 600.0 |
Maximum aggregate capacity of credit facility allowable | 1,800.0 |
Letters of credit | $ 36.8 | $ 38.7
Line of credit facility fee percentage | 0.10% |
Covenant description for debt instrument | The new Credit Agreement contains certain covenants, including limitations on subsidiary indebtedness, a minimum consolidated fixed charge coverage ratio of 2.50:1.00 and a maximum consolidated leverage ratio of 3.50:1.00. The consolidated fixed charge coverage ratio includes a calculation of earnings before interest, taxes, depreciation, amortization, rent and non-cash share-based compensation expense to fixed charges. Fixed charges include interest expense, capitalized interest and rent expense. The consolidated leverage ratio includes a calculation of adjusted debt to earnings before interest, taxes, depreciation, amortization, rent and non-cash share-based compensation expense. Adjusted debt includes outstanding debt, outstanding stand-by letters of credit and similar instruments, five-times rent expense and excludes any premium or discount recorded in conjunction with the issuance of long-term debt. In the event that the Company should default on any covenant (subject to customary grace periods, cure rights and materiality thresholds) contained in the new Credit Agreement, certain actions may be taken, including, but not limited to, possible termination of commitments, immediate payment of outstanding principal amounts plus accrued interest and other amounts payable under the new Credit Agreement and litigation from lenders. |
Line of credit facility covenant compliance | As of December 31, 2017, the Company remained in compliance with all covenants under the new Credit Agreement. |
Spread over Alternate Base rate [Member] |  |
Unsecured Revolving Credit Facility |  |
Line of credit current interest rate | 0.00% |
Spread over Eurodollar Revolving rate [Member] |  |
Unsecured Revolving Credit Facility |  |
Line of credit current interest rate | 0.90% |
Through maturity [Member] |  |
Unsecured Revolving Credit Facility |  |
Minimum debt instrument consolidated fixed charge coverage ratio covenant | 250.00% |
Maximum debt instrument consolidated leverage ratio covenant | 350.00% |
Letter of credit [Member] |  |
Unsecured Revolving Credit Facility |  |
Line of credit facility sublimit | $ 200.0 |
Swing line revolver [Member] |  |
Unsecured Revolving Credit Facility |  |
Line of credit facility sublimit | $ 75.0 |

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- Definition The minimum fixed charge coverage ratio the Company is required to maintain in order to be in compliance with the covenant clauses of the debt agreement. + References No definition available. + Details
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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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