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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Compensation and Retirement Disclosure [Abstract]      
Accumulated Benefit Obligation, April 30 $ 21,156 $ 22,441  
Change in Projected Benefit Obligations      
Projected benefit obligations, beginning of year 22,441 19,857  
Interest cost 912 893 $ 857
Actuarial (gain) loss (1,155) 2,688  
Actual benefits paid (1,042) (997)  
Projected benefit obligations, end of year 21,156 22,441 19,857
Change in Plan Assets      
Fair value of plan assets, beginning of year 17,094 16,288  
Actual (loss) return on plan assets (299) 1,028  
Employer contributions 64 775  
Actual benefits paid (1,042) (997)  
Fair value of plan assets, end of year 15,817 17,094 $ 16,288
Funded status - under (5,339) (5,347)  
Amounts Recognized in the Consolidated Balance Sheets consist of:      
Noncurrent assets 0 0  
Noncurrent liabilities (5,339) (5,347)  
Net amount recognized (5,339) (5,347)  
Amounts recognized in accumulated other comprehensive income (loss) consist of:      
Net actual loss 10,295 11,011  
Deferred tax benefit (3,850) (4,206)  
After-tax actuarial loss $ 6,445 $ 6,805  
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30      
Discount rate 4.50% 4.20%  
Rate of compensation increase 0.00% 0.00%  
Mortality table Apr 30, 2016 RP-2014 and Apr 30,2015 RP-2014    
Projection scale Apr 30, 2016 MP-2015 and Apr 30, 2015 MP-2014    
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30      
Discount rate 4.20% 4.60%  
Expected long-term return on plan assets 8.25% 8.25%  
Rate of compensation increase 0.00% 0.00%