| **Investments in Affiliates**        | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Long-term Investments [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Investments in Affiliates            | Investments in AffiliatesThe Company held the following investments in equity method affiliates as of July 31, 2014: Equity Method AffiliatesOwnershipInterestSlifer, Smith, and Frampton/Vail Associates Real Estate, LLC (“SSF/VARE”)50%KRED50%Clinton Ditch and Reservoir Company43%The Company had total net investments in equity method affiliates of $7.5 million and $7.1 million as of July 31, 2014 and 2013, respectively, classified as “deferred charges and other assets” in the accompanying Consolidated Balance Sheets. The amount of retained earnings that represent undistributed earnings of 50-percent-or-less-owned entities accounted for by the equity method was $4.2 million and $3.8 million as of July 31, 2014 and 2013, respectively. During the years ended July 31, 2014, 2013 and 2012, distributions in the amounts of $1.0 million, $0.7 million and $0.8 million, respectively, were received from equity method affiliates. |

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| - Definition
The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.
+ 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32847-111569Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569
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