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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		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Remaining Performance Obligations [Abstract]
Remaining performance obligations	$ 428,900		$ 428,900
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]
Costs capitalized	11,200		11,200
Amortization	1,000	$ 700	3,100	$ 1,900
Cost of revenue [Abstract]
Operating and administrative expenses	245,683	240,715	736,233	717,348
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-02-01
Remaining Performance Obligations [Abstract]
Remaining performance obligations	$ 372,600		$ 372,600
Expected timing of satisfaction, period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-02-01
Remaining Performance Obligations [Abstract]
Remaining performance obligations	$ 15,800		$ 15,800
Expected timing of satisfaction, period
Shipping and Handling [Member]
Cost of revenue [Abstract]
Operating and administrative expenses	$ 7,700	$ 7,900	$ 22,700	$ 24,400

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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