Subsequent Events	12 Months Ended
Subsequent Events	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	18. SUBSEQUENT EVENTS On August 14, 2018, the Company entered into a Merger Agreement with Cabot Microelectronics and Cobalt Merger Sub, providing for the acquisition of the Company by Cabot Microelectronics. The Merger Agreement provides that, upon the terms and subject to the satisfaction or valid waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into the Company, with the Company continuing as the surviving corporation and a wholly owned subsidiary of Cabot Microelectronics. If the Merger is completed, each outstanding share of the Company’s common stock will automatically be converted into the right to receive $55.65 in cash and 0.2000 shares of common stock of Cabot Microelectronics, par value $0.001 per share at the effective time of the Merger. Immediately prior to closing, each restricted stock unit award relating to the Company’s shares of common stock granted prior to August 14, 2018 will vest and be cancelled in exchange for the Merger Consideration in respect of each share of the Company’s common stock underlying the applicable award. Each restricted stock unit award granted on or following August 14, 2018 will be converted into a corresponding award relating to shares of Cabot Microelectronics common stock and continue to vest post-closing in accordance with the terms of the applicable award agreement. The Merger Agreement and the Merger have been unanimously approved by the boards of directors of the Company and Cabot Microelectronics. The consummation of the Merger is subject to customary closing conditions, including the adoption of the Merger Agreement by the Company’s shareholders.

KMG CHEMICALS INC 10-K