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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