Quarterly report pursuant to Section 13 or 15(d)

Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail)

v3.10.0.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 105,254 $ 113,869 $ 103,349 $ 114,110
Other comprehensive income before reclassifications     (323) 216
Amounts reclassified from accumulated other comprehensive loss     510 619
Total other comprehensive income 180 355 187 835
Ending Balance 104,809 101,935 104,809 101,935
Pension and Other Postretirement Benefits Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (8,599) (8,439)
Amounts reclassified from accumulated other comprehensive loss     510 619
Total other comprehensive income     510 619
Ending Balance (8,089) (7,820) (8,089) (7,820)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     349 5
Other comprehensive income before reclassifications     (323) 216
Total other comprehensive income     (323) 216
Ending Balance 26 221 26 221
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (8,243) (7,954) (8,250) (8,434)
Ending Balance $ (8,063) $ (7,599) $ (8,063) $ (7,599)