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Debt - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 15, 2017
USD ($)
Jun. 30, 2014
USD ($)
Mar. 18, 2014
USD ($)
Jan. 31, 2018
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
d
$ / shares
Jan. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Debt instrument issued       $ 67,625,000   $ 67,625,000   $ 67,625,000
Debt instrument issuance costs       453,000   453,000   640,000
Notes payable, Fair Value       66,188,000   66,188,000   63,852,000
Debt instrument, carrying amount       62,062,000   $ 62,062,000   59,758,000
Convertible debt, remaining discount amortization period           13 months    
Debt instrument, interest expense           $ 2,117,000 $ 1,940,000  
Term loan facility           $ 393,000,000    
PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, term   5 years            
Line of credit facility, maximum credit commitment   $ 50,000,000            
Credit facility expiry date           Jun. 30, 2019    
Line of credit facility, unutilized commitment fee percentage   0.25%            
Outstanding indebtedness under the Credit Facility       0   $ 0   $ 0
Cerberus Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, term 5 years              
Outstanding indebtedness under the Credit Facility       $ 6,000,000   6,000,000    
Term loan facility $ 393,000,000              
Revolving credit facility $ 25,000,000              
Line of credit facility, interest rate description Borrowings under the Cerberus Credit Facility bear interest, at the Borrower's option, at a Reference Rate plus 3.75% or a LIBOR Rate plus 6.5%, each as defined the Financing Agreement.              
Aggregate amount of each consecutive quarterly scheduled principal installment           $ 1,500,000    
Excess cash flow payment percentage           25.00%   50.00%
Leverage ratio       3.50%   3.50%    
Debt issuance cost       $ 1,300,000   $ 1,300,000    
London Interbank Offered Rate (LIBOR) | Cerberus Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate 6.50%              
Base Rate | Cerberus Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate 3.75%              
Domestic Subsidiaries                
Debt Instrument [Line Items]                
Percentage of equity interests pledged           100.00%    
Foreign Subsidiaries                
Debt Instrument [Line Items]                
Percentage of equity interests pledged           65.00%    
Letter of Credit Sublimit | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum credit commitment   $ 5,000,000            
Uncommitted Accordion Feature | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum credit commitment   $ 20,000,000            
Scenario 1 | London Interbank Offered Rate (LIBOR) | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   2.25%            
Scenario 2 | London Interbank Offered Rate (LIBOR) | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   1.00%            
Scenario 2 | Federal Funds Open Rate | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   0.50%            
5.25% Convertible Senior Notes Due 2019                
Debt Instrument [Line Items]                
Debt instrument issued     $ 100,000,000          
Debt instrument, stated interest rate     5.25%          
Debt instrument, convertible, conversion ratio           166.2593    
Initial Conversion price | $ / shares       $ 6.01   $ 6.01    
Debt instrument, redemption price percentage     100.00%          
Debt instrument, convertible, earliest date           Mar. 06, 2017    
Debt instrument, convertible, threshold percentage of stock price trigger           130.00%    
Debt instrument, convertible, threshold trading days | d           20    
Debt instrument, convertible, threshold consecutive trading days | d           30    
Debt instrument conversion option           $ 28,100,000    
Debt instrument issuance costs       $ 3,400,000   3,400,000    
Deferred debt instrument issuance costs       2,500,000   2,500,000    
Debt instrument, interest expense       $ 2,084,000 $ 1,976,000 $ 4,131,000 $ 3,935,000  
Debt instrument, interest rate, effective percentage       13.90%   13.90%    
Term Loan | Cerberus Credit Facility                
Debt Instrument [Line Items]                
Debt instrument issued       $ 393,000,000   $ 393,000,000    
Current and long-term net       $ 391,700,000   $ 391,700,000