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Goodwill and Intangible Assets - Changes in Net Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 31, 2019
Feb. 28, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Goodwill, Beginning balance $ 81,634 $ 70,603
Goodwill acquired 893 11,031
Goodwill, Ending balance $ 82,527 $ 81,634