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Share Repurchase Plan - Additional Information (Detail) - $ / shares
12 Months Ended 156 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2024
Oct. 06, 2016
Apr. 08, 2015
Jun. 06, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]              
Number of shares authorized to repurchase       8,000,000 6,000,000 3,000,000 1,000,000
Share repurchase plan open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission            
Treasury stock, common, shares 6,787,460 6,562,461 6,787,460        
Common Stock [Member]              
Equity, Class of Treasury Stock [Line Items]              
Treasury stock, common, shares 6,787,460   6,787,460        
Repurchase agreement, purchase price per share $ 6.33 $ 3.72 $ 3.66        
Number of shares repurchased 224,999 214,971