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Long-Term Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Jul. 18, 2018
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Apr. 30, 2018
Jun. 16, 2014
May 30, 2012
Debt Instrument [Line Items]              
Long-term debt   $ 122,849,000 $ 190,372,000        
Original issue discount of issuance of debt   3,476,000 7,038,000        
Debt, Face Amount             $ 82,200,000
Total Credit Agreement debt   142,609,000          
Loss on debt extinguishment   2,662,000 620,000 $ 0      
Interest rate during period             4.10%
Term Loan              
Debt Instrument [Line Items]              
Total Credit Agreement debt   69,451,000          
Revolver              
Debt Instrument [Line Items]              
Total Credit Agreement debt   9,000,000          
Other nonrecourse debt [Member]              
Debt Instrument [Line Items]              
Debt, Face Amount   10,200,000.0 $ 9,500,000.0        
2014 Credit Agreement              
Debt Instrument [Line Items]              
Long-term debt   $ 78,400,000          
Debt Instrument, Interest Rate, Effective Percentage [Abstract]   8.70% 7.00%        
Original issue discount of issuance of debt   $ 1,800,000          
Total Credit Agreement debt   78,451,000 $ 152,245,000        
2014 Credit Agreement | Term Loan              
Debt Instrument [Line Items]              
Total Credit Agreement debt   69,451,000 152,245,000        
2014 Credit Agreement | Revolver              
Debt Instrument [Line Items]              
Total Credit Agreement debt   9,000,000 $ 0        
2012 Credit Agreement | Revolver              
Debt Instrument [Line Items]              
Maximum borrowing capacity under credit facility   20,000,000          
2012 Credit Agreement | Letter of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity under credit facility   5,000,000          
Digonex Nonrecourse Debt              
Debt Instrument [Line Items]              
Debt, Face Amount           $ 6,200,000.0  
Interest rate (as a percent)           5.00%  
NextRadio LLC Nonrecourse Debt [Member]              
Debt Instrument [Line Items]              
Debt, Face Amount   $ 4,000,000.0          
Interest rate (as a percent)   6.00%          
Base Rate | 2014 Credit Agreement              
Debt Instrument [Line Items]              
Variable rate, floor (as a percent)   2.00%          
Basis spread on variable rate (as a percent)   6.00%          
London Interbank Offered Rate (LIBOR) | 2014 Credit Agreement              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   7.00%          
Secured Debt | Digonex Nonrecourse Debt              
Debt Instrument [Line Items]              
Long-term debt           $ 1,500,000  
Unsecured Debt | Digonex Nonrecourse Debt              
Debt Instrument [Line Items]              
Long-term debt           $ 4,700,000  
Subsequent Event [Member]              
Debt Instrument [Line Items]              
Total Credit Agreement debt         $ 28,000,000    
Subsequent Event [Member] | 2014 Credit Agreement              
Debt Instrument [Line Items]              
Principal redemption premium 2.00%            
Principal redemption premium, additional quarterly amount 0.50%            
Debt Instrument, Interest Rate, Increase (Decrease) 0.50%