Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
Aug. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies 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 NGA and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Until September 19, 2014 (Note 10), the Company's investments in Mesquite and Eldorado (Notes 4 and 5) were accounted for using the equity method of accounting. Accordingly, for all periods presented in this report, 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 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; 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 Through September 19, 2014 (Note 10), the Company recognized 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 six months ended August 31, 2014 included equity in the net income of its investees for the investees' six months ended June 30, 2014. 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.

Basis of Presentation and Summary of Significant Accounting Policies

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 NGA and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Until September 19, 2014 (Note 10), the Company's investments in Mesquite and Eldorado (Notes 4 and 5) were accounted for using the equity method of accounting. Accordingly, for all periods presented in this report, 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 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; 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

Through September 19, 2014 (Note 10), the Company recognized 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 six months ended August 31, 2014 included equity in the net income of its investees for the investees' six months ended June 30, 2014.

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.