Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Feb. 28, 2015
Accounting Policies [Abstract]
Basis of Accounting and Presentation	Basis of Accounting and Presentation The Company prepares its consolidated 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 of the Company include the accounts of NGA and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company's investment in Mesquite is accounted for using the equity method of accounting as was its investment in Eldorado until the ERI Merger on September 19, 2014. Commencing September 19, 2014, the ERI shares received in the ERI Merger are classified, and accounted for, as available-for-sale securities and are carried at estimated fair value based on trading activity (Level 1 inputs as defined by GAAP). Realized gains and losses (if any) on the ERI shares are included in net income, while unrealized gains and losses are included in the Company's consolidated statements of operations as a component of other comprehensive income. The Company recognizes equity in the net income (loss) and other comprehensive income (loss) of its unconsolidated investees accounted for using the equity method on a calendar year basis. For example, the Company’s net income for the year ended February 28, 2015 includes equity in the net income of Mesquite for the year ended December 31, 2014 (through September 18, 2014 for Eldorado). Accordingly, except for the ERI shares and otherwise as required by GAAP and disclosed herein, the Company measures all of its assets and liabilities on the historical cost basis. The Company's investments 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, as applicable, prolonged periods of the trading value of available-for-sale securities being less than cost, 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 or market 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; (7) the investee’s capital strength and liquidity; and (8) the reaction to changes in markets and specific performance of the Company's investments by the investing public. In determining whether the carrying value of the Company’s investment in Mesquite is less than its estimated fair value, 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 participants. 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 expected 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.
Reclassifications	Reclassifications Certain minor reclassifications of prior year’s amounts have been made for comparability with the current year presentation. The reclassifications had no effect on net income or comprehensive income.
Use of estimates	Use of estimates Timely preparation of financial statements in accordance with GAAP 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 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.
Income Taxes	Income Taxes The Company records estimated penalties and interest, if any, related to income tax matters, including uncertain tax positions, if any, as a component of income tax expense (Note 7). At least annually, management evaluates positions taken (or to be taken) on tax returns that remain subject to examination by federal and state authorities (i.e., tax years 2011 and thereafter) to determine if there are “uncertain tax positions” as defined by GAAP.
Members' capital	Members’ capital Allocations of net income and distributions to the Members are determined in accordance with the Company’s operating agreement.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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