Isle Acquisition and Preliminary Purchase Price Accounting - Schedule of Purchase Consideration Calculation (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	May 01, 2017	Apr. 28, 2017
Isle Of Capri
Business Acquisition [Line Items]
Cash paid for premiums and interest on Isle's long term debt	$ 26.6
Isle Of Capri | Merger Agreement
Business Acquisition [Line Items]
Cash consideration paid as percent of outstanding shares	58.00%
Equity consideration paid as percent of outstanding shares	42.00%
Right to receive per share	$ 23.00
Stock election exchange rate (as a percent)	42.00%
Stock consideration (per share)		$ 19.12
Isle Of Capri | Merger Agreement | Converted to a Right to Receive 1.638 Share of ERI Stock
Business Acquisition [Line Items]
Number of shares granted on conversion (per share)	1.638