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Stockholders' Equity - Restricted Stock Units (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
item
$ / shares
shares
Mar. 31, 2016
USD ($)
item
$ / shares
shares
Apr. 04, 2015
USD ($)
item
$ / shares
shares
Feb. 03, 2018
USD ($)
item
shares
Jan. 28, 2017
USD ($)
item
Jan. 30, 2016
USD ($)
item
Stockholders' Equity            
Target price for vesting of shares, four (in dollars per share) $ 26.90          
(Decrease) increase in excess tax benefits (in dollars) | $       $ 70,000 $ 200,000 $ 1,300,000
Restricted Stock            
Stockholders' Equity            
Compensation expense (in dollars) | $       $ 1,600,000 $ 2,900,000 $ 4,100,000
Granted (in shares) | shares       118,676    
Restricted Stock | Director            
Stockholders' Equity            
Vesting period       1 year    
March 2017 RSU            
Stockholders' Equity            
Vesting period 3 years          
Compensation expense (in dollars) | $ $ 306,000          
Number of employees to whom awards are granted | item 2          
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period 25.00%          
Consecutive period for which closing stock price should be achieved to vest shares 20 days          
Target price for vesting of shares, one (in dollars per share) $ 19.10          
Target price for vesting of shares, two (in dollars per share) 21.70          
Target price for vesting of shares, three (in dollars per share) $ 24.30          
Number of employees to whom awards are granted who subsequently resigned | item 1          
Number of thresholds achieved | item       3    
Granted (in shares) | shares 23,551          
March 2016 RSU            
Stockholders' Equity            
Vesting period   3 years        
Compensation expense (in dollars) | $   $ 238,000        
Number of employees to whom awards are granted | item   2        
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period   25.00%        
Consecutive period for which closing stock price should be achieved to vest shares   20 days        
Target price for vesting of shares, one (in dollars per share)   $ 20.75        
Target price for vesting of shares, two (in dollars per share)   23.50        
Target price for vesting of shares, three (in dollars per share)   26.25        
Target price for vesting of shares, four (in dollars per share)   $ 29.00        
Number of thresholds achieved | item       3    
Granted (in shares) | shares   24,816        
March 2015 RSU            
Stockholders' Equity            
Vesting period     3 years      
Compensation expense (in dollars) | $     $ 331,000      
Number of employees to whom awards are granted | item     2      
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period     25.00%      
Consecutive period for which closing stock price should be achieved to vest shares     20 days      
Target price for vesting of shares, one (in dollars per share)     $ 27.00      
Target price for vesting of shares, two (in dollars per share)     29.25      
Target price for vesting of shares, three (in dollars per share)     31.50      
Target price for vesting of shares, four (in dollars per share)     $ 33.50      
Number of thresholds achieved | item       0 0 0
Granted (in shares) | shares     16,823