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SIGNIFICANT ACCOUNTING POLICIES - Fair value measurements (Details) - USD ($)
May 31, 2024
Aug. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost $ 9,914,000 $ 57,940,000
Unrealized gains 0 0
Unrealized losses (39,000) (115,000)
Fair value 9,875,000 57,825,000
Level 1:    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost 9,914,000 57,940,000
Unrealized gains 0 0
Unrealized losses (39,000) (115,000)
Fair value 9,875,000 57,825,000
Level 1: | Term deposits (due within one year)    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost 1,500,000 4,000,000
Unrealized gains 0 0
Unrealized losses 0 0
Fair value 1,500,000 4,000,000
Level 1: | U.S. government and agency securities (due within one year)    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost   4,453,000
Unrealized gains  
Unrealized losses   (5,000)
Fair value   4,448,000
Level 1: | Commercial paper (due within one year)    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost   9,070,000
Unrealized gains  
Unrealized losses   (9,000)
Fair value   9,061,000
Level 1: | Corporate debt securities (due within one year)    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost 8,414,000 40,417,000
Unrealized gains 0 0
Unrealized losses (39,000) (101,000)
Fair value 8,375,000 40,316,000
Level 2:    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost 0 0
Unrealized gains 0 0
Unrealized losses 0 0
Fair value 0 0
Level 3:    
Defined Benefit Plan Disclosure [Line Items]    
Amortized cost 0 0
Unrealized gains 0 0
Unrealized losses 0 0
Fair value $ 0 $ 0