BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue Recognition	Revenue Recognition In general, we recognize revenue when it is both realized or realizable and earned. We consider revenue to be realized or realizable and earned when the following conditions exist: there is persuasive evidence of an arrangement (generally a client contract exists); the services or products have been performed or delivered to the client; the sales price is fixed or determinable; and collection has occurred or is probable. Revenue from helicopter services, including search and rescue (“SAR”) services, is recognized based on contractual rates as the related services are performed. The charges under these contracts are generally based on a two-tier rate structure consisting of a daily or monthly fixed fee plus additional fees for each hour flown. These contracts are for varying periods and generally permit the client to cancel the contract before the end of the term. We also provide services to clients on an “ad hoc” basis, which usually entails a shorter contract notice period and duration. The charges for ad hoc services are based on an hourly rate or a daily or monthly fixed fee plus additional fees for each hour flown. In order to offset potential increases in operating costs, our long-term contracts may provide for periodic increases in the contractual rates charged for our services. We recognize the impact of these rate increases when the criteria outlined above have been met. This generally includes written recognition from the clients that they are in agreement with the amount of the rate escalation. Cost reimbursements from clients are recorded as reimbursable revenue with the related reimbursed costs recorded as reimbursable expense on our condensed consolidated statements of operations. Eastern Airways International Limited (“Eastern Airways”) and Capiteq Limited, operating under the name Airnorth, primarily earn revenue through charter and scheduled airline services and provision of airport services (Eastern Airways only). Both chartered and scheduled airline service revenue is recognized net of passenger taxes and discounts. Revenue is recognized at the earlier of the period in which the service is provided or the period in which the right to travel expires, which is determined by the terms and conditions of the ticket. Ticket sales are recorded within deferred revenue in accordance with the above policy. Airport services revenue is recognized when earned. Prior to the sale of our 100% interest in Bristow Academy, Inc. (“Bristow Academy”) on November 1, 2017, Bristow Academy, our helicopter training unit, primarily earned revenue from military training, flight training provided to individual students and ground school courses. We recognized revenue from these sources using the same revenue recognition principles described above as services are provided.
Goodwill	Goodwill Goodwill is recorded when the cost of acquired businesses exceeds the fair value of the identifiable net assets acquired. Goodwill has an indefinite useful life and is not amortized, but is assessed for impairment annually or when events or changes in circumstances indicate that a potential impairment exists.
Other Intangible Assets	Other Intangible Assets Intangible assets with finite useful lives are amortized over their respective estimated useful lives to their estimated residual values.
Recent Accounting Pronouncements	Recent Accounting Pronouncements We consider the applicability and impact of all accounting standard updates (“ASUs”). ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position or results of operations. In May 2014, the Financial Accounting Standards Board (the “FASB”) issued accounting guidance on revenue recognition for revenue from contracts with customers. This accounting guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and will replace most existing revenue recognition guidance when it becomes effective. This new standard is effective for annual reporting periods beginning after December 15, 2016. However, in July 2015, the FASB approved the deferral of the effective date of the revenue recognition standard permitting public entities to apply the new revenue standard to annual reporting periods beginning after December 15, 2017. Early application is permitted, but not before the original effective date of December 15, 2016. The standard is required to be adopted using either the full retrospective approach, with all prior periods presented adjusted, or the modified retrospective approach, with a cumulative adjustment to retained earnings on the balance sheet. We have not adopted this standard yet but expect to adopt the new revenue standard using the modified retrospective transition approach. We are continuing to evaluate the effect this accounting guidance will have on our financial statements and related disclosures and are still assessing the differences between the new revenue standard and current accounting practices. In November 2015, the FASB issued accounting guidance that changed how deferred taxes are classified on an entity’s balance sheet. The accounting guidance requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. The new guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016 and early adoption is permitted. The guidance may be applied either prospectively, for all deferred tax assets and liabilities, or retrospectively. If applied prospectively, entities are required to include a statement that prior periods were not retrospectively adjusted. If applied retrospectively, entities are also required to include quantitative information about the effects of the change on prior periods. We adopted this accounting guidance using the prospective adjustment option effective April 1, 2017 and prior periods were not retrospectively adjusted. As of March 31, 2017, we had $0.1 million in current deferred tax assets and $0.8 million in current deferred tax liabilities. As a result of this adoption, as of April 1, 2017 and going forward we will classify all current deferred taxes as non-current. In February 2016, the FASB issued accounting guidance which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. This accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, with early adoption permitted. Additionally, this accounting guidance requires a modified retrospective transition approach for all leases existing at, or entered into after the date of initial application, with an option to use certain transition relief. We have not yet adopted this standard and are currently evaluating the effect this standard will have on our financial statements. In March 2016, the FASB issued accounting guidance related to accounting for employee share-based payments. The accounting guidance is intended to simplify several aspects of accounting for share-based payment award transactions including income tax consequences, classification of awards as either equity or liabilities and classification on the statements of cash flows. This accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016 and early adoption is permitted. We adopted this standard effective April 1, 2017. The requirements related to the tax consequences of share-based payments were applied prospectively and resulted in $2.3 million recorded as an increase to the income tax provision during the nine months ended December 31, 2017. We elected to record forfeitures of share-based awards based on actual forfeitures which did not have a material effect on our financial statements. The provisions related to the presentation of excess tax benefits on the condensed consolidated statements of cash flows did not impact our financial statements as there was no excess tax benefit recorded for the periods presented. The provisions related to employee taxes paid for withheld shares are presented as a cash flow financing activity required us to revise our prior period condensed consolidated statement of cash flows by $0.8 million as a decrease in net cash used in operating activities and a corresponding decrease in net cash provided by financing activities for the nine months ended December 31, 2016. None of the other provisions of the pronouncement had a material effect on our consolidated financial statements. In October 2016, the FASB issued accounting guidance related to current and deferred income taxes for intra-entity transfer of assets other than inventory. This accounting guidance requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and eliminates the exception for an intra-entity transfer of an asset other than inventory. This accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is permitted. We have not yet adopted this accounting guidance and are currently evaluating the effect this accounting guidance will have on our financial statements. In January 2017, the FASB issued accounting guidance which clarifies the definition of a business with the objective of adding guidance to assist in evaluating whether transactions should be accounted for as acquisitions of assets or businesses. The amendment provides criteria for determining when a transaction involves the acquisition of a business. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, then the transaction does not involve the acquisition of a business. If the criteria are not met, then the amendment requires that to be considered a business, the operation must include at a minimum an input and a substantive process that together significantly contribute to the ability to create an output. The guidance may reduce the number of transactions accounted for as business acquisitions. This accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is permitted. The amendments should be applied prospectively, and no disclosures are required at the effective date. We have not yet adopted this accounting guidance and are currently evaluating the effect this accounting guidance will have on our financial statements. In March 2017, the FASB issued accounting guidance related to the presentation of net periodic pension cost and net periodic postretirement benefit cost. The accounting guidance requires employers to disaggregate the service cost component from the other components of net benefit cost and disclose the amount of net benefit cost that is included in the statement of operations or capitalized in assets, by line item. The accounting guidance requires employers to report the service cost component in the same line item(s) as other compensation costs and to report other pension-related costs (which include interest costs, amortization of pension-related costs from prior periods, and the gains or losses on plan assets) separately and exclude them from the subtotal of operating income. The accounting guidance also allows only the service cost component to be eligible for capitalization when applicable. This accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is permitted as of the first interim period of an annual period for which interim or annual financial statements have not been issued. The accounting guidance requires application on a retrospective basis for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the statement of operations and on a prospective basis for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. We have not yet adopted this accounting guidance and are currently evaluating the effect this accounting guidance will have on our financial statements. In May 2017, the FASB issued accounting guidance on determining which changes to the terms or conditions of share-based payment awards require an entity to apply modification accounting. This pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted, and is applied prospectively to changes in terms or conditions of awards occurring on or after the adoption date. We have not yet adopted this accounting guidance and are currently evaluating the effect this accounting guidance will have on our financial statements. In August 2017, the FASB issued new accounting guidance on derivatives and hedging, which amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in the financial statements. This accounting guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, and earlier adoption is permitted. We have not yet adopted this accounting guidance and are currently evaluating the effect this accounting guidance will have on our financial statements.