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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)