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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Oct. 31, 2015 | Jan. 31, 2015
Canyons Obligation [Member] |  |
Debt Instrument, Year of Maturity | 2063 |
PCMR [Member] |  |
Goodwill, Purchase Accounting Adjustments |  | $ 13.0

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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