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Acquisitions (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired				$ 25,227	$ 152,110
Revenue		$ 455,675	$ 436,456	1,318,850	1,266,329
Operating income (loss)		67,431	51,160	164,702	142,731
Atypon Systems Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired	$ 121,000
Revenue		8,300	8,000	24,600	10,400
Operating income (loss)		$ (800)	$ (1,500)	$ (1,800)	$ (2,000)

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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