Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.8.0.1
Employee Benefit Plans - Additional Information (Detail) - USD ($)
 6 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Self-Insured medical plan liability $ 105,000 $ 174,000
Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Contributions to its defined benefit pension plan 0  
Contributions expected for the balance of fiscal 2018 52,000  
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Post retirement benefit plan 0  
Defined benefit plan, benefit expected to pay for the balance of fiscal 2018 $ 83,000