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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 23, 2019
May 20, 2019
Aug. 28, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
May 31, 2019
May 29, 2019
Class of Stock [Line Items]                
Preferred stock shares authorized to issue (in shares)       1,000,000 1,000,000      
Preferred stock shares par value (in dollars per share)       $ 0.01 $ 0.01      
Shares sold (in shares)     200,000          
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01      
Equity Securities, FV-NI               $ 6,900
Price of stock sold (in dollars per share)             $ 69.00  
Proceeds from Issuance of Common Stock       $ 454,343 $ 0 $ 215,725    
Public Stock Offering                
Class of Stock [Line Items]                
Shares sold (in shares) 6,000,000 5,000,000            
Common stock, par value (in dollars per share)   $ 0.01            
Over-Allotment Option                
Class of Stock [Line Items]                
Shares sold (in shares) 900,000 750,000