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Summary of Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Mar. 31, 2014
Term Loan Facility |  |  |  |
Debt [Line Items] |  |  |  |
Term loan agreement | $ 300,000 | [1] | $ 300,000 | [1]
Revolving Credit Agreement |  |  |  |
Debt [Line Items] |  |  |  |
Revolving line of credit |  | [1],[2] |  | [1],[2]
September 2013 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Aggregate debt outstanding | 500,000 |  | 500,000 |
Weighted average remaining life in years | 8 years 10 months 24 days |  | 9 years 4 months 24 days |
Weighted average coupon rate on notes outstanding | 4.86% |  | 4.86% |
Fair value of debt outstanding (Level 2) | 525,860 |  | 520,979 |
August 2011 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Aggregate debt outstanding | 165,000 |  | 165,000 |
Weighted average remaining life in years | 6 years 1 month 6 days |  | 6 years 7 months 6 days |
Weighted average coupon rate on notes outstanding | 4.42% |  | 4.42% |
Fair value of debt outstanding (Level 2) | 170,438 |  | 168,653 |
September 2010 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Aggregate debt outstanding | 425,000 |  | 425,000 |
Weighted average remaining life in years | 5 years 1 month 6 days |  | 5 years 7 months 6 days |
Weighted average coupon rate on notes outstanding | 4.25% |  | 4.25% |
Fair value of debt outstanding (Level 2) | 437,951 |  | 436,264 |
July 2003 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Aggregate debt outstanding | 35,000 |  | 35,000 |
Weighted average remaining life in years | 9 months 18 days |  | 1 year 3 months 18 days |
Weighted average coupon rate on notes outstanding | 4.61% |  | 4.61% |
Fair value of debt outstanding (Level 2) | $ 35,699 |  | $ 36,018 |
[1] | Fair values approximate carrying values because the borrowings bear interest at variable rates.
[2] | $600 million was available under the revolver at September 30, 2014 and March 31, 2014.

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: 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 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + 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(a)(2)) -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 Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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