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Fair Value - Fair Value Measurements Using Significant Unobservable Inputs (Detail) - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 28, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Financial assets, begining balance $ 1,350,000 $ 1,317,000
Change in present value of contingent consideration 0 0
Proceeds from sale of marketable securities (1,350,000) (1,350,000)
Contingent consideration liability recorded as the result of the acquisitions (Note 2)   0
Fair market value adjustments   33,000
Contingent consideration payments   0
Financial assets, ending balance 0 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Financial liabilities, begining balance 26,518,000 3,261,000
Contingent consideration liability recorded as the result of the acquisitions (Note 2)   25,101,000
Change in present value of contingent consideration 609,000 865,000
Fair market value adjustments   0
Proceeds from sale of marketable securities 0 0
Contingent consideration payments   2,100
Financial liabilities, ending balance $ 27,127,000 $ 27,127,000