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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

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References 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 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 + Details
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- Definition 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 + Details
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