MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2016	Oct. 31, 2015
Amortized cost and fair value of marketable securities
Amortized Cost	$ 442.0	$ 423.0
Gross Unrealized Gains	17.0	17.0
Gross Unrealized Losses	5.0	3.0
Fair Value	453.5	437.4
Equity Fund
Amortized cost and fair value of marketable securities
Amortized Cost	40.0	38.0
Gross Unrealized Gains	5.0	5.0
Fair Value	45.0	43.0
Fixed Income Funds
Amortized cost and fair value of marketable securities
Amortized Cost	15.0
Fair Value	15.0
U.S. Government Debt Securities
Amortized cost and fair value of marketable securities
Amortized Cost	85.0	79.0
Gross Unrealized Gains	3.0	3.0
Fair Value	88.0	82.0
Municipal Debt Securities
Amortized cost and fair value of marketable securities
Amortized Cost	41.0	29.0
Gross Unrealized Gains	2.0	2.0
Fair Value	43.0	31.0
Corporate Debt Securities
Amortized cost and fair value of marketable securities
Amortized Cost	113.0	121.0
Gross Unrealized Gains	5.0	4.0
Gross Unrealized Losses		1.0
Fair Value	118.0	124.0
International Debt Securities
Amortized cost and fair value of marketable securities
Amortized Cost	39.0	48.0
Gross Unrealized Losses	5.0	1.0
Fair Value	34.0	47.0
Mortgage-Backed Securities
Amortized cost and fair value of marketable securities
Amortized Cost	109.0	108.0
Gross Unrealized Gains	2.0	3.0
Gross Unrealized Losses		1.0
Fair Value	$ 111.0	$ 110.0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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