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Indebtedness - Bank Loan Agreement - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Minimum |  |  |
Debt [Line Items] |  |  |
Commitment fees on the unused portion of credit facility |  | 0.15% |
Interest coverage ratio |  | 300.00% |
Minimum | Eurodollar Rates |  |  |
Debt [Line Items] |  |  |
Revolving credit rate |  | 1.25% |
Maximum |  |  |
Debt [Line Items] |  |  |
Consolidated debt to consolidated total capitalization, ratio |  | 55.00% |
Commitment fees on the unused portion of credit facility |  | 0.30% |
Maximum | Eurodollar Rates |  |  |
Debt [Line Items] |  |  |
Revolving credit rate |  | 2.00% |
Current Bank Loan Agreement |  |  |
Debt [Line Items] |  |  |
Bank loan agreement expiration date | 2019-06 |  |
Revolving credit facility | $ 900,000,000 |  |
Credit facility term | 5 years |  |
Revolving line of credit | $ 600,000,000 |  |
Term loan | $ 300,000,000 |  |
Revolving credit facility, remaining borrowing capacity |  | $ 0 | $ 580,000,000
Prime or Federal Funds | Minimum |  |  |
Debt [Line Items] |  |  |
Revolving credit rate |  | 0.25% |
Prime or Federal Funds | Maximum |  |  |
Debt [Line Items] |  |  |
Revolving credit rate |  | 1.00% |
Term Loan Facility |  |  |
Debt [Line Items] |  |  |
Outstanding borrowing |  | $ 300,000,000 |
Revolving Credit Agreement |  |  |
Debt [Line Items] |  |  |
Outstanding borrowing |  | $ 600,000,000 |

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- Definition Line of Credit Facility Expiration Dates + References No definition available. + Details
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- Definition Line of credit facility, revolving line of credit + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line of credit facility, term loan + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition 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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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