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Summary of Performance option activity (Detail)
3 Months Ended 6 Months Ended
Sep. 30, 2018
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incentive Stock Option Plans, Additional vesting based on performance | shares 19,760  
Performance Based Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incentive Stock Option Plans, Beginning balance | shares 141,425 81,666
Incentive Stock Option Plans, Additional vesting based on performance | shares   77,598
Incentive Stock Option Plans, Options exercised | shares   (11,839)
Incentive Stock Option Plans, Option forfeited | shares (1,014)  
Incentive Stock Option Plans, Ending balance | shares 140,411 141,425
Weighted Average Price Per Share, Beginning balance $ 11.49 $ 11.49
Weighted Average Price Per Share, Additional vesting based on performance   11.49
Weighted Average Price Per Share, Options exercised   11.49
Weighted Average Price Per Share, Option forfeited 11.49  
Weighted Average Price Per Share, Ending balance 11.49 11.49
Exercisable Weighted Average Price Per Share, Beginning balance 11.49 11.49
Exercisable Weighted Average Price Per Share, Ending balance $ 11.49 $ 11.49