Commitments and Contingencies Operating Leases The Company is party to various noncancelable lease agreements, primarily for its international and domestic office and lab space. Future minimum lease payments under noncancelable operating leases in each of the five years and thereafter subsequent to May 31, 2016 are as follows: 2017 $ 9,956 2018 7,903 2019 6,580 2020 5,219 2021 4,112 Thereafter 13,039 Total $ 46,809 Total rent expense was $11.2 million , $10.6 million and $9.5 million for the years ended May 31, 2016 , 2015 and 2014 , respectively. Legal Proceedings and Government Investigations The Company is subject to periodic legal proceedings, investigations and claims that arise in the ordinary course of business. The Company cannot predict with certainty the ultimate resolution of legal proceedings, investigations and claims asserted against it. Except for the matters described below, the Company does not believe that any currently pending legal proceeding to which the Company is a party will have a material adverse effect on its business, results of operations, cash flows or financial condition. The costs of defense and amounts that may be recovered against the Company may be covered by insurance for certain matters. Litigation and Commercial Claims The Company is currently a defendant in a consolidated purported class and collective action, Edgar Viceral and David Kruger v Mistras Group, et al , pending in the U.S. District Court for the Northern District of California. This matter results from the consolidation of two cases originally filed in California state court in April 2015. The consolidated case alleges violations of California statutes, primarily the California Labor Code, and seeks to proceed as a collective action under the U.S. Fair Labor Standards Act. The case is predicated on claims for allegedly missed rest and meal periods, inaccurate wage statements, and failure to pay all wages due, as well as related unfair business practices, and is requesting payment of all damages, including unpaid