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Components of Interest Expense (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Interest expense, borrowings: |  |  |
Interest expense | $ 66,159 | $ 63,523 | $ 60,701
Capitalized interest | (415) | (221) | (425)
Amortization of transaction costs | 4,133 | 4,428 | 4,249
Interest expense resulting from derivatives | 20,819 | 22,641 | 23,856
Total interest expense | $ 90,696 | $ 90,371 | $ 88,381

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