Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2018
Jan. 31, 2018
Dec. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Jul. 31, 2016
Income Taxes Disclosure [Line Items]            
Corporate federal income tax rate 21.00%   35.00%      
Provisional reduction of net deferred tax assets due to tax reform act   $ 17,100   $ 17,100    
Transition tax impact $ 3,900 3,900   $ 3,900    
Minimum tax on certain foreign earnings in excess of foreign subsidiaries tangible assets       10.00%    
Deferred tax assets, operating loss carry forwards, domestic 111,100 111,100   $ 111,100    
Deferred tax assets, operating loss carry forwards, state and local 148,700 148,700   148,700    
Deferred tax assets, operating loss carry forwards, foreign 2,400 2,400   $ 2,400    
Operating loss carry forwards, expiry beginning year       2019    
Deferred tax assets, tax credit carry forwards, foreign 2,600 2,600   $ 2,600    
Tax credit carry forward with an unlimited carryforward period 200 200   200    
Tax receivable for AMT credits 600 600   600    
Valuation allowance 38,305 38,305   38,305 $ 58,134  
Valuation allowance decreased       19,800    
Undistributed earnings of foreign subsidiaries           $ 58,600
Deferred tax liability recognized         14,675  
Deferred tax benefit recorded due to reduction of previously recorded deferred tax laiblity       14,675 (14,675)  
Unrecognized tax benefits which would reduce income tax expense if recognized 600 600   600    
Total gross interest accrued 100 100   100 $ 100  
Federal [Member]            
Income Taxes Disclosure [Line Items]            
Deferred tax assets, tax credit carry forwards, research 3,800 3,800   3,800    
State and Local Jurisdiction [Member]            
Income Taxes Disclosure [Line Items]            
Deferred tax assets, tax credit carry forwards, research 1,800 1,800   1,800    
Deferred tax assets tax credit carry forward investment $ 200 $ 200   $ 200    
Irish Operations [Member]            
Income Taxes Disclosure [Line Items]            
Undistributed earnings of foreign subsidiaries           58,600
Deferred tax liability recognized           $ 14,700