Business Segment Information Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Oct. 31, 2017
Segment Reporting Information [Line Items]
Revenue, Net	$ 294,883	$ 256,847	$ 839,889	$ 777,816
Long-Lived Assets	357,461		357,461		$ 309,775
UNITED STATES \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue, Net	210,840	207,187	613,858	633,950
Long-Lived Assets	228,066		228,066		235,663
Europe [Member] \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue, Net	73,678	41,808	196,023	119,980
Foreign Currency Transaction Gain, before Tax	99	(143)	(219)	(175)
Long-Lived Assets	102,430		102,430		53,569
Rest of World [Member] \| Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue, Net	10,365	7,852	30,008	23,886
Foreign Currency Transaction Gain, before Tax	182	$ 314	226	$ (90)
Long-Lived Assets	$ 26,965		$ 26,965		$ 20,543
Sales [Member] \| Non-US [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	28.50%	19.30%	26.90%	18.50%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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