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Acquisitions (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Sep. 30, 2016	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Business Acquisition [Line Items]
Cash, net of cash acquired										$ 0	$ 125,924	$ 0
Goodwill		$ 1,019,801				$ 982,101				1,019,801	982,101
Revenue		477,300	$ 455,700	$ 451,700	$ 411,400	452,200	$ 436,400	$ 425,600	$ 404,300	1,796,103	1,718,530	1,727,037
Operating income (loss)		$ 74,800	$ 67,400	$ 82,800	14,500	$ 63,500	$ 51,200	$ 47,700	$ 43,800	239,535	206,153	$ 188,113
Atypon Systems Inc [Member]
Business Acquisition [Line Items]
Cash, net of cash acquired	$ 121,000
Intangible assets					48,000
Goodwill					70,000
Goodwill deductible for tax purposes					$ 70,000
Revenue										32,900	19,100
Operating income (loss)										$ 2,700	$ 3,500

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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