Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Detail)

v3.19.2
Long-Term Debt - Additional Information (Detail)
12 Months Ended
Dec. 19, 2018
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
CSV of COLI Contracts      
Debt Instrument [Line Items]      
Outstanding policy loans   $ 93,200,000 $ 66,700,000
Maximum | CSV of COLI Contracts      
Debt Instrument [Line Items]      
Average interest rate   8.00%  
Minimum | CSV of COLI Contracts      
Debt Instrument [Line Items]      
Average interest rate   4.76%  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility borrowings   $ 226,900,000  
Line of credit facility, remaining borrowing capacity   420,200,000  
Previous Term Loan      
Debt Instrument [Line Items]      
Average interest rate     2.60%
Previous Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility borrowings     $ 0
Line of credit facility, remaining borrowing capacity     122,100,000
Standby Letters of Credit      
Debt Instrument [Line Items]      
Long-term debt arrangement   2,900,000 2,900,000
Standby Letters of Credit | Other Financial Institutions      
Debt Instrument [Line Items]      
Long-term debt arrangement   $ 8,500,000 7,400,000
Credit Agreement      
Debt Instrument [Line Items]      
Credit agreement initiation date Dec. 19, 2018    
Line of credit facility borrowings $ 226,900,000    
Average interest rate   3.50%  
Unamortized debt issuance costs   $ 4,000,000 2,700,000
Credit Agreement | Maximum      
Debt Instrument [Line Items]      
Pro forma leverage ratio 3.25    
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   2.00%  
Credit Agreement | Maximum | Base Rate Loans      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   1.00%  
Credit Agreement | Minimum      
Debt Instrument [Line Items]      
Pro forma domestic liquidity $ 50,000,000    
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   1.25%  
Credit Agreement | Minimum | Base Rate Loans      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   0.25%  
Credit Agreement | Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument term 5 years    
Line of credit facility, maximum borrowing capacity $ 650,000,000    
Line of credit facility, maturity date   Dec. 19, 2023  
Long-term debt   $ 226,900,000 $ 238,900,000
Credit Agreement | Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Quarterly commitment fee on average daily unused amount of Credit Facilities   0.35%  
Credit Agreement | Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Quarterly commitment fee on average daily unused amount of Credit Facilities   0.20%