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Reclassifications from Accumulated Other Comprehensive Loss to Condensed Consolidated Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 499 | $ 538 | $ 1,121 | $ 1,278
Interest and other debt costs | (12,559) | (9,918) | (25,688) | (18,831)
Earnings before income taxes | 81,892 | 69,839 | 139,383 | 109,422
Tax effect | 21,067 | 15,667 | 34,859 | 25,167
Net earnings | 60,907 | 54,172 | 104,580 | 84,255
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings before income taxes | 283 | 277 | 567 | 580
Tax effect | 99 | 97 | 198 | 203
Net earnings | 184 | 180 | 369 | 377
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | 103 | 99 | 209 | 222
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and other debt costs | $ 180 | $ 178 | $ 358 | $ 358

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