Quarterly report pursuant to Section 13 or 15(d)

License Agreements (Detail)

v3.21.2
License Agreements (Detail)
£ in Millions, $ in Millions
3 Months Ended
Aug. 31, 2021
GBP (£)
item
Aug. 31, 2021
USD ($)
item
May 31, 2021
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Number of license agreements | item 2 2  
Annual charges under the agreement £ 0.6 $ 0.8  
Prepaid royalties | $   $ 0.1 $ 0.1
Maximum      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Royalty on net sales (as a percent)   2.00%  
Minimum      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Royalty on net sales (as a percent)   0.75%