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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017		Oct. 31, 2018	Oct. 31, 2017
Amortization from Accumulated Other Comprehensive Loss [Abstract]
Operating and administrative expenses	$ 248,627	$ 241,301	[1]	$ 502,400	$ 487,039	[1]
Unamortized Retirement Costs [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Amortization from Accumulated Other Comprehensive Loss [Abstract]
Operating and administrative expenses	$ 1,400	$ 1,500		$ 2,800	$ 2,900
[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.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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