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Change in Plan Assets and Obligations (Detail) - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at end of the period   $ 103,443 $ 103,443    
Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at beginning of the period $ 97,941   97,941    
Benefit obligation at end of the period       $ 97,941  
Pension Plans, Defined Benefit          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Employer contributions     0 3,000 $ 0
Current liabilities   (10,731) (10,731)    
Noncurrent liabilities   (35,252) (35,252)    
Net amount recognized   (45,983) (45,983)    
Pension Plans, Defined Benefit | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Actuarial (gain) loss 748     1,785  
Current liabilities (1,791)     (1,791)  
Noncurrent liabilities (41,642)     (39,087)  
Net amount recognized (43,433)     (40,878)  
Pension Plans, Defined Benefit | Change in Benefit Obligations          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at beginning of the period   101,490      
Service cost   546      
Interest cost   1,599      
Plan curtailment   (432)      
Benefits paid   (2,059)      
Actuarial (gain) loss   2,322      
Foreign currency exchange rate changes   (23)      
Benefit obligation at end of the period 101,490 103,443 103,443    
Pension Plans, Defined Benefit | Change in Benefit Obligations | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at beginning of the period 97,941 101,490 97,941 95,830  
Service cost 393     1,182  
Interest cost 1,313     3,814  
Benefits paid (1,610)     (4,895)  
Actuarial (gain) loss 3,322     2,082  
Foreign currency exchange rate changes 131     (72)  
Benefit obligation at end of the period 101,490     97,941 95,830
Pension Plans, Defined Benefit | Change In Plan Assets          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Fair value of plan assets at beginning of the period   58,148      
Actual return   1,182      
Expected return   32      
Actuarial (gain) loss   217      
Administrative expenses   (15)      
Plan curtailment   (100)      
Employer contributions   625      
Benefits paid   (2,059)      
Foreign currency exchange rate changes   (60)      
Fair value of plan assets at end of the period 58,148 57,536 57,536    
Payroll tax unrecognized in benefit obligation at end of the period   76 76    
Unfunded status at end of the period   (45,983) (45,983)    
Pension Plans, Defined Benefit | Change In Plan Assets | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Fair value of plan assets at beginning of the period 57,146 58,148 57,146 57,174  
Actual return 2,138     577  
Expected return 16     51  
Actuarial (gain) loss 109     148  
Administrative expenses (7)     (27)  
Employer contributions 435     4,465  
Benefits paid (1,610)     (4,895)  
Foreign currency exchange rate changes 139     (51)  
Fair value of plan assets at end of the period 58,148     57,146 57,174
Payroll tax unrecognized in benefit obligation at end of the period 91     83  
Unfunded status at end of the period (43,433)     (40,878)  
Other Pension Plans, Defined Benefit          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Current liabilities   (282) (282)    
Noncurrent liabilities   (2,642) (2,642)    
Net amount recognized   (2,924) (2,924)    
Other Pension Plans, Defined Benefit | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Actuarial (gain) loss (335)     (1,138)  
Current liabilities (418)     (418)  
Noncurrent liabilities (4,399)     (4,393)  
Net amount recognized (4,817)     (4,811)  
Other Pension Plans, Defined Benefit | Change in Benefit Obligations          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at beginning of the period   4,817      
Service cost   29      
Interest cost   75      
Participant contributions   65      
Plan amendment   (1,861)      
Benefits paid   (526)      
Actuarial (gain) loss   325      
Benefit obligation at end of the period 4,817 2,924 2,924    
Other Pension Plans, Defined Benefit | Change in Benefit Obligations | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Benefit obligation at beginning of the period 4,811 4,817 4,811 5,573  
Service cost 23     81  
Interest cost 64     201  
Participant contributions 58     411  
Benefits paid (346)     (1,170)  
Actuarial (gain) loss 207     (285)  
Benefit obligation at end of the period 4,817     4,811 $ 5,573
Other Pension Plans, Defined Benefit | Change In Plan Assets          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Employer contributions   461      
Participant contributions   65      
Benefits paid   (526)      
Unfunded status at end of the period   $ (2,924) $ (2,924)    
Other Pension Plans, Defined Benefit | Change In Plan Assets | Predecessor          
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]          
Employer contributions 288     759  
Participant contributions 58     411  
Benefits paid (346)     (1,170)  
Unfunded status at end of the period $ (4,817)     $ (4,811)