Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	May 31, 2014
Accounting Policies [Abstract]
Basis of Accounting and Presentation	Basis of Accounting and Presentation The Company prepares its financial statements on the accrual basis of accounting in conformity with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial statements include the accounts of the NGA and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Investments in Eldorado and Mesquite (Notes 4 and 5) are accounted for using the equity method of accounting. Accordingly, the Company measures all of its assets and liabilities on the historical cost basis of accounting except as required by GAAP. Such assets are evaluated at least annually (and more frequently when circumstances warrant) to determine if events or changes in circumstances indicate that the carrying value may not be recoverable. Examples of such events or changes in circumstances that might indicate impairment testing is warranted might include an adverse change in the legal, regulatory or business climate relative to gaming nationally or in the jurisdictions in which the Company’s investees operate, or a significant long-term decline in historical or forecasted earnings or cash flows of the investee or the fair value of its property or business, possibly as a result of competitive or other economic or political factors. In evaluating whether a loss in value is other than temporary, the Company considers: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the investee, including any specific events which may influence the operations; (3) the Company’s intent and ability to retain its investments in the investee for a period of time sufficient to allow for any anticipated recovery in fair value; (4) the condition and trend of the economic cycle; (5) the investee’s historical and forecasted financial performance; (6) trends in the general market; and (7) the investee’s capital strength and liquidity. In determining whether the carrying value of the Company’s investment in an investee is less than its estimated fair value of the investment, a discounted cash flow approach to value is used and is based on Level 3 inputs as defined by GAAP. The Company’s valuation model incorporates an estimated weighted-average cost of capital (effectively, a discount rate) and terminal value multiples that are used by market participant. The estimated weighted-average cost of capital is based on the risk free interest rate at the time, adjusted for specific risk factors. The Company also considers the metrics of specific business transactions that may be comparable to varying degrees. The weight assigned to these approaches to value in the Company’s impairment evaluation may vary from period to period depending upon evolving events. Forecasted prospective financial information used in the model is based on management’s excepted course of action. Sensitivity analyses are also performed related to key assumptions used, including possible variations in the weighted-average cost of capital and terminal value multiples, among others.
Equity in the net income (loss) and other comprehensive income (loss) of unconsolidated investees	Equity in the net income (loss) and other comprehensive income (loss) of unconsolidated investees The Company recognizes equity in the net income (loss) and other comprehensive income (loss) of its unconsolidated investees on a calendar year basis. For example, the Company’s net income for the three months ended May 31, 2014 includes equity in the net income of its investees for the investees' three months ended March 31, 2014.
Use of estimates	Use of estimates Timely preparation of financial statements in accordance with the rules and regulations of the Commission requires management to make estimates that affect the reported amounts of assets and liabilities at the date of the financial statements, as well as the reported amounts of income and expenses during the reporting periods. Actual results could differ from those estimates. Management estimates that the Company will eventually sell its investments in unconsolidated investees following an expected economic recovery at a price sufficient to realize the carrying value of the Company’s assets which estimates are subject to material variation over the next year.

Disclosure of accounting policy for the equity method of accounting for investments in common stock or other interests including unconsolidated subsidiaries, corporate joint ventures, noncontrolling interests in real estate ventures, limited partnerships, and limited liability companies. The accounting policy may include information such as: (1) initially recording an investment in the stock of an investee at cost; (2) adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee after the date of acquisition; and (3) adjustments to reflect the investor's share of changes in the investee's capital (dividends). This disclosure may also include a detailed description of the policy for determining the amount of equity method losses recognized after an investment has been reduced to zero as a result of previous losses, reasons for not using the equity method when the investor company owns 20 percent or more of the voting stock of the investee's company (including identification of the significant investee), reasons for using the equity method when the ownership percentage is less than 20 percent, and discussion of recognition of equity method losses when an investor's total investment in an investee includes, in addition to an investment in common stock, other investments such as preferred stock and loans to the investee. An entity also may describe how such investments are assessed for impairment.

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