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Subsequent Event (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 01, 2018
USD ($)
location
Sep. 27, 2016
USD ($)
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Jul. 31, 2018
USD ($)
Subsequent Event [Line Items]                            
Drew down                     $ 513,878 $ 1,013,365 $ 782,104  
Capital lease assets     $ 17,900       $ 15,000       17,900 15,000    
Pro forma information                            
Net sales             614,977 $ 562,523 $ 591,846 $ 549,800 2,511,469 2,319,146 1,858,182  
Net income     $ 205,792 $ 195,420 $ 212,260 $ 205,104 $ 14,273 $ 8,226 $ 17,224 $ 9,163 $ 62,971 $ 48,886 $ 12,564  
Customer relationships                            
Purchase price                            
Useful life                     10 years 10 months 24 days 10 years 10 months 24 days    
First Lien Term Loan                            
Subsequent Event [Line Items]                            
Loan repayment   $ 381,200                        
Subsequent Event                            
Subsequent Event [Line Items]                            
Capital lease assets                           $ 73,600
Capital lease liabilities                           $ 73,600
Subsequent Event | Third Amendment                            
Subsequent Event [Line Items]                            
Aggregate principal amount $ 996,800                          
Reduction to interest rate margin at each pricing level (as a percent) 25.00%                          
Subsequent Event | Third Amendment | LIBOR                            
Subsequent Event [Line Items]                            
Margin added to variable rate (as a percent) 2.75%                          
Subsequent Event | ABL facility                            
Subsequent Event [Line Items]                            
Drew down $ 143,000                          
Subsequent Event | First Lien Term Loan                            
Subsequent Event [Line Items]                            
Loan repayment $ 571,800                          
Titan                            
Pro forma information                            
Net sales                     $ 478,400      
Net income                     11,900      
Pro forma net sales                     2,989,900      
Pro forma operating income                     $ 74,900      
Titan | Subsequent Event                            
Subsequent Event [Line Items]                            
Number Of Locations | location 30                          
Number Of Provinces | location 5                          
Aggregate purchase price $ 627,000                          
Issuance preferred stock to current shareholders of Titan 35,000                          
Purchase price                            
Preliminary fair value of consideration transferred 627,000                          
Issuance preferred stock to current shareholders of Titan $ 35,000