XML 34 R24.htm IDEA: XBRL DOCUMENT v3.8.0.1
Other Assets - Additional Information (Detail) - USD ($)
Mar. 04, 2018
May 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Cash surrender value of life insurance $ 4,598,000 $ 7,093,000
Surrender value of cancelled life insurance policies $ 2,546,000