Legal Proceedings	9 Months Ended
Feb. 29, 2016
Legal Proceedings
Legal Proceedings	Note 15 — Legal Proceedings DynCorp International LLC v. AAR Airlift Group, Inc. On November 5, 2015, AAR Airlift Group, Inc. (“AAR Airlift”), a wholly-owned subsidiary of AAR CORP. filed a motion to dismiss a First Amended Complaint filed by DynCorp International LLC (“DynCorp”) alleging that AAR Airlift misappropriated DynCorp’s trade secrets in connection with the submission of proposals pursuant to the solicitation issued by the Department of State Bureau of International Narcotics and Law Enforcement Affairs, Office of Aviation (“INL/A”) in support of the WASS program. On January 14, 2016, the Court granted AAR Airlift’s motion to dismiss the First Amended Complaint. On February 2, 2016, DynCorp filed an appeal to the United States Court of Appeals for the Eleventh Circuit with respect to the Court’s order on the motion to dismiss and other orders issued by the Court in this case. AAR Airlift will continue to defend itself vigorously against DynCorp’s lawsuit and any attempt to invalidate or interfere with AAR Airlift’s lawful participation in the INL/A contract award competition. OIG Investigation The U.S. Department of State received — and referred to its Office of Inspector General (“OIG”) — a May 2015 letter from DynCorp in which DynCorp made substantially the same allegations against AAR Airlift as set forth in both its original complaint and its First Amended Complaint. The OIG is investigating these allegations, and AAR Airlift is cooperating fully in that investigation.

Note 15 — Legal Proceedings

DynCorp International LLC v. AAR Airlift Group, Inc.

On November 5, 2015, AAR Airlift Group, Inc. (“AAR Airlift”), a wholly-owned subsidiary of AAR CORP. filed a motion to dismiss a First Amended Complaint filed by DynCorp International LLC (“DynCorp”) alleging that AAR Airlift misappropriated DynCorp’s trade secrets in connection with the submission of proposals pursuant to the solicitation issued by the Department of State Bureau of International Narcotics and Law Enforcement Affairs, Office of Aviation (“INL/A”) in support of the WASS program.

On January 14, 2016, the Court granted AAR Airlift’s motion to dismiss the First Amended Complaint. On February 2, 2016, DynCorp filed an appeal to the United States Court of Appeals for the Eleventh Circuit with respect to the Court’s order on the motion to dismiss and other orders issued by the Court in this case.

AAR Airlift will continue to defend itself vigorously against DynCorp’s lawsuit and any attempt to invalidate or interfere with AAR Airlift’s lawful participation in the INL/A contract award competition.

OIG Investigation

The U.S. Department of State received — and referred to its Office of Inspector General (“OIG”) — a May 2015 letter from DynCorp in which DynCorp made substantially the same allegations against AAR Airlift as set forth in both its original complaint and its First Amended Complaint. The OIG is investigating these allegations, and AAR Airlift is cooperating fully in that investigation.