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Long-term Debt - Narrative (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 17, 2020
USD ($)
Jan. 30, 2018
USD ($)
day
$ / shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 16, 2020
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jan. 12, 2018
USD ($)
Debt Instrument [Line Items]                    
Repayments of convertible debt           $ 10,595,000   $ 0    
Gain on extinguishment of debt           $ 4,779,000   $ 0    
Unsecured Debt                    
Debt Instrument [Line Items]                    
Stated interest rate                   2.50%
Debt instrument, face amount                   $ 25,000,000.0
1.5% Convertible Unsecured Senior Notes Due February 2023                    
Debt Instrument [Line Items]                    
Stated interest rate     1.50%   1.50% 1.50%   1.50% 1.50%  
1.5% Convertible Unsecured Senior Notes Due February 2023 | Convertible Debt                    
Debt Instrument [Line Items]                    
Stated interest rate   1.50%                
Debt instrument, face amount   $ 200,000,000                
Debt Instrument, amount purchased     $ 12,000,000.0 $ 5,700,000         $ 25,400,000  
Repayments of convertible debt     5,900,000 $ 4,700,000   $ 10,600,000     17,300,000  
Gain on extinguishment of debt     4,800,000              
Effective interest rate percentage   6.00%                
Interest expense     2,400,000   $ 2,500,000 4,900,000   $ 5,100,000    
Interest expense, contractual interest     700,000   $ 800,000 1,400,000   $ 1,500,000    
Conversion ratio   0.0222748                
Conversion price (in dollars per share) | $ / shares   $ 44.89                
Percentage of conversion price   130.00%                
Threshold trading days | day   20                
Threshold consecutive trading days | day   30                
Threshold consecutive trading days, sale price per share | day   5                
Measurement period | day   5                
Percentage of sales price per share   98.00%                
Amount of indebtedness in event of default   $ 40,000,000.0                
Revolving Credit Facility Due January 2022                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 200,000,000.0   350,000,000.0     350,000,000.0     350,000,000.0  
Covenant suspension period, borrowing availability 85.00%                  
Consolidated net book value of eligible receivables 70.00%                  
Consolidated net book value of eligible inventory 20.00%                  
Long-term line of credit     71,000,000.0     71,000,000.0     71,000,000.0  
Letters of credit outstanding     28,400,000     28,400,000     28,400,000  
Remaining borrowing capacity     37,300,000     $ 37,300,000     37,300,000  
Commitment fee percentage 0.50%                  
Unamortized debt issuance costs     500,000              
Minimum interest coverage ratio           3.0        
Maximum senior secured leverage ratio           2.25        
Maximum leverage ratio           3.75        
Revolving Credit Facility Due January 2022 | UNITED STATES                    
Debt Instrument [Line Items]                    
Covenant maximum cash balance     45,000,000.0     $ 45,000,000.0     45,000,000.0  
Revolving Credit Facility Due January 2022 | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee percentage             0.25%      
Revolving Credit Facility Due January 2022 | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee percentage             0.50%      
Revolving Credit Facility Due January 2022 | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.50%           1.75%      
Revolving Credit Facility Due January 2022 | London Interbank Offered Rate (LIBOR) | Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 3.75%           3.00%      
Revolving Credit Facility Due January 2022 | Base Rate | Minimum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.50%           0.75%      
Revolving Credit Facility Due January 2022 | Base Rate | Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.75%           2.00%      
Letter of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 50,000,000.0     $ 50,000,000.0     $ 50,000,000.0