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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, beginning balance $ (20,181) $ (11,877) $ (20,378) $ (12,225)
Gains/(losses) recognized in OCI (690) (35) (734) 128
Reclasses from OCI to net income 243 184 484 369
Net period OCI (447) 149 (250) 497
Accumulated other comprehensive income, ending balance (20,628) (11,728) (20,628) (11,728)
Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, beginning balance 183 193 235 92
Gains/(losses) recognized in OCI (690) (35) (804) (3)
Reclasses from OCI to net income 63 67 125 136
Net period OCI (627) 32 (679) 133
Accumulated other comprehensive income, ending balance (444) 225 (444) 225
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, beginning balance (9,811) (9,811) (9,811) (9,811)
Accumulated other comprehensive income, ending balance (9,811) (9,811) (9,811) (9,811)
Pension/Post-retirement Benefits        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, beginning balance (9,059) 15 (9,129) (116)
Gains/(losses) recognized in OCI     70 131
Net period OCI     70 131
Accumulated other comprehensive income, ending balance (9,059) 15 (9,059) 15
Interest Rate Swaps        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, beginning balance (1,494) (2,274) (1,673) (2,390)
Reclasses from OCI to net income 180 117 359 233
Net period OCI 180 117 359 233
Accumulated other comprehensive income, ending balance $ (1,314) $ (2,157) $ (1,314) $ (2,157)