| **Income Taxes (Notes)**             | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Income Tax Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Income Tax Disclosure [Text Block]   | 12.    Income TaxesThe Company had Federal net operating loss (“NOL”) carryforwards that expired in the year ended July 31, 2008 and were limited in deductibility each year under Section 382 of the Internal Revenue Code. The Company had only been able to use these NOL carryforwards to the extent of approximately $8.0 million per year through December 31, 2007 (the “Section 382 Amount”). However, during the year ended July 31, 2005, the Company amended previously filed tax returns (for tax years 1997-2002) in an effort to remove the restrictions under Section 382 of the Internal Revenue Code (the “Code”) on approximately $73.8 million of NOL carryforwards to reduce future taxable income. As a result, the Company requested a refund related to the amended returns in the amount of $6.2 million and reduced its Federal tax liability in the amount of $19.6 million in subsequent returns. These NOL carryforwards relate to fresh start accounting from the Company’s reorganization in 1992. During the year ended July 31, 2006, the Internal Revenue Service (“IRS”) completed its examination of the Company’s filing position in these amended returns and disallowed the Company’s request for refund and its position to remove the restrictions under Section 382 of the Code. The Company appealed the examiner’s disallowance of these NOL carryforwards to the Office of Appeals. In December 2008, the Office of Appeals denied the Company’s appeal, as well as a request for mediation. The Company disagreed with the IRS interpretation disallowing the utilization of the NOL’s and in August 2009, the Company filed a complaint in the United States District Court for the District of Colorado against the United States of America seeking a refund of approximately $6.2 million in Federal income taxes paid, plus interest. On July 1, 2011, the District Court granted the Company summary judgment, concluding that the IRS’s decision disallowing the utilization of the NOLs was inappropriate. The computations themselves, however, remained in dispute, and the District Court’s ruling was subject to appeal by the IRS.  Subsequently, the District Court proceedings were continued pending settlement discussions between the parties.The Company also filed two related tax proceedings in the United States Tax Court regarding calculation of NOL carryover deductions for tax years 2006, 2007, and 2008. The two proceedings involved substantially the same issues as the litigation in the District Court for tax years 2000 and 2001 in which the Company disagreed with the IRS as to the utilization of NOLs. Like the District Court proceedings, the Tax Court proceedings were continued pending settlement discussions between the parties.On January 29, 2015, the parties completed the execution of a comprehensive settlement agreement resolving all issues and computations in the above mentioned pending proceedings, which allowed the Company to utilize a significant portion of the NOLs. As a result, the Company reversed $27.7 million of other long-term liabilities related to uncertain tax benefits, and recorded income tax benefits of $23.8 million for the utilization of the NOLs, including the reversal of accrued interest and penalties, within its Consolidated Condensed Statements of Operations for the nine months ended April 30, 2015. |

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| - Definition
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
+ References
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