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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance |  |  | $ 2,305,554 | $ 2,480,715
Balance | $ 1,747,564 | $ 2,375,932 | 1,747,564 | 2,375,932
Available for Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | 72 | (444) | (208) | 235
Gains/(losses) recognized in OCI | (188) | 235 | (50) | (569)
Reclasses from OCI to net income | 115 | (24) | 257 | 101
Net period OCI | (73) | 211 | 207 | (468)
Balance | (1) | (233) | (1) | (233)
Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (9,811) | (9,811) | (9,811) | (9,811)
Balance | (9,811) | (9,811) | (9,811) | (9,811)
Pension/Post-retirement Benefits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | 4,683 | (9,059) | 4,683 | (9,129)
Gains/(losses) recognized in OCI |  |  |  | 70
Net period OCI |  |  |  | 70
Balance | 4,683 | (9,059) | 4,683 | (9,059)
Interest Rate Swaps |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (1,387) | (1,314) | (1,530) | (1,673)
Reclasses from OCI to net income | 70 | 180 | 213 | 539
Net period OCI | 70 | 180 | 213 | 539
Balance | (1,317) | (1,134) | (1,317) | (1,134)
Accumulated other comprehensive loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (6,443) | (20,628) | (6,866) | (20,378)
Gains/(losses) recognized in OCI | (188) | 235 | (50) | (499)
Reclasses from OCI to net income | 185 | 156 | 470 | 640
Net period OCI | (3) | 391 | 420 | 141
Balance | $ (6,446) | $ (20,237) | $ (6,446) | $ (20,237)

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