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Revenue Recognition, Contracts with Customers, Remaining Performance Obligations, Assets Recognized for the Costs to Obtain or Fulfill a Contract (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 249,800   $ 249,800  
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]        
Costs capitalized 6,600   6,600  
Amortization 400   1,200  
Cost of revenue [Abstract]        
Operating and administrative expenses 248,627 $ 241,301 [1] 502,400 $ 487,039 [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-08-01        
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 237,200   $ 237,200  
Expected timing of satisfaction, period 12 months   12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-01        
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 12,600   $ 12,600  
Expected timing of satisfaction, period    
Shipping and Handling [Member]        
Cost of revenue [Abstract]        
Operating and administrative expenses $ 8,600 $ 8,800 $ 16,500 $ 16,600
[1] Due to the retrospective adoption of Accounting Standards Update ("ASU") 2017-07, total net benefits of $2.0 million and $3.9 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest and Other Income for the three and six months ended October 31, 2017, respectively. Total net benefits related to the non-service components of defined benefit and other post-employment benefit plans were $2.1 million and $4.5 million for the three and six months ended October 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information.