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Summary of Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 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 | 9 years 2 months 12 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) | 522,988 |  | 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 3 months 18 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) | 170,332 |  | 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 4 months 24 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) | 438,074 |  | 436,264 |
July 2003 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Aggregate debt outstanding | 35,000 |  | 35,000 |
Weighted average remaining life in years | 1 year 1 month 6 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) | $ 35,866 |  | $ 36,018 |
[1] | Fair values approximate carrying values because the borrowings bear interest at variable rates.
[2] | $600.0 million was available under the revolver at June 30, 2014 and March 31, 2014.

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