Long-Term Debt - Additional Information (Details)				3 Months Ended		6 Months Ended
	Dec. 17, 2020 USD ($)	Jun. 12, 2020 USD ($)	Jun. 02, 2020 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of notes							$ 249,705,000
Senior Credit Facilities
Debt Instrument [Line Items]
Deferred debt issuance costs				$ 252,000		$ 252,000
Minimum liquidity				$ 75,000,000		$ 75,000,000
Debt instrument, covenant description						The Credit Agreement contains certain affirmative and negative covenants customary for financings of this type that, among other things, limit our and our subsidiaries’ ability to incur additional indebtedness or liens, to dispose of assets, to make certain fundamental changes, to designate subsidiaries as unrestricted, to make certain investments, to prepay certain indebtedness and to pay dividends, or to make other distributions or redemptions/repurchases, in respect of our and our subsidiaries’ equity interests. In addition, the Credit Agreement contains financial covenants, each tested quarterly, (1) a net secured leveraged ratio of not greater than 3.25 to 1.00; (2) a net total leverage ratio of not greater than 4.25 to 1.00; and (3) minimum liquidity of at least $75 million. The Credit Agreement also contains events of default customary for financings of this type, including certain customary change of control events. As of March 31, 2021, we were in compliance with all Credit Agreement covenants.
Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Net leverage ratio				4.25		4.25
Net secured leverage ratio						3.25%
Amended Senior Credit Facilities
Debt Instrument [Line Items]
Deferred debt issuance costs	$ 500,000
Refinancing fee paid to third parties	$ 100,000
Debt Instrument, interest rate description						The Amendment, among other things, revised certain interest rates in the Credit Agreement. Following delivery of a compliance certificate for the first full fiscal quarter after the Amendment No. 1 Effective Date, the applicable margins for the revolving credit and term facilities is subject to a pricing grid based upon the net total leverage ratio as follows (i) if the net total leverage ratio is greater than 3.00 to 1.00, the applicable margin is LIBOR plus 3.00% or ABR plus 2.00%; (ii) if the net total leverage ratio is less than or equal to 3.00 to 1.00 but greater than 2.50 to 1.00, the applicable margin is LIBOR plus 2.75% or ABR plus 1.75%; (iii) if the net total leverage ratio is less than or equal to 2.50 to 1.00 but greater than 2.00 to 1.00, the applicable margin is LIBOR plus 2.50% or ABR plus 1.50%; (iv) if the net total leverage ratio is less than or equal to 2.00 to 1.00 but greater than 1.50 to 1.00, the applicable margin is LIBOR plus 2.25% or ABR plus 1.25%; and (v) if the net total leverage ratio is less than or equal to 1.50 to 1.00, the applicable margin is LIBOR plus 2.20% or ABR plus 1.00%. As a result of the Amendment, the applicable LIBOR floor was reduced from 0.50% to 0.00%. From the Amendment No. 1 Effective Date until the fiscal quarter ended December 31, 2020, the interest rate was LIBOR plus 2.50%. For the three months ended March 31, 2021, the interest rate was LIBOR plus 2.25%.
Interest expense				$ 1,000,000.0		$ 2,400,000
Description of unused line fee						In addition, the quarterly commitment fee required to be paid based on the unused portion of the revolving facility is subject to a pricing grid based upon the net total leverage ratio as follows (i) if the net total leverage ratio is greater than 3.00 to 1.00, the unused line fee is 0.500%; (ii) if the net total leverage ratio is less than or equal to 3.00 to 1.00 but greater than 2.50 to 1.00, the unused line fee is 0.450%; (iii) if the net total leverage ratio is less than or equal to 2.50 to 1.00 but greater than 2.00 to 1.00, the unused line fee is 0.400%; (iv) if the net total leverage ratio is less than or equal to 2.00 to 1.00 but greater than 1.50 to 1.00, the unused line fee is 0.350%; and (v) if the net total leverage ratio is less than or equal to 1.50 to 1.00, the unused line fee is 0.300%.
Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	0.00%	0.50%		2.25%	2.50%
3.00% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Aggregate principal amount			$ 175,000,000.0
Debt instrument, interest rate			3.00%	3.00%		3.00%
Debt Instrument, option to purchase additional principal amount			$ 25,000,000.0
Proceeds from issuance of notes			$ 169,800,000
Debt instrument, maturity date			Jun. 01, 2025
Debt instrument, conversion initial rate | shares			26.7271
Debt instrument, convertible principal amount			$ 1,000
Debt instrument, conversion price | $ / shares			$ 37.42
Carrying amount of equity component, net of taxes and transaction costs				$ 14,400,000		$ 14,400,000
Deferred debt issuance costs				4,228,000		4,228,000
Interest expense				2,374,000		$ 4,782,000
Four Year Senior Secured Term Loan Facility | Senior Credit Facilities
Debt Instrument [Line Items]
Debt instrument term		4 years
Credit facility maximum borrowing capacity		$ 125,000,000.0
Net proceeds from issuance of credit facility		123,000,000.0
Four Year Senior Secured Term Loan Facility | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Debt instrument, frequency of periodic principal payments						quarterly
Debt instrument periodic payments equivalent percentage of annual amount on original principal amount during first two years	1.25%
Debt instrument periodic payments equivalent percentage of annual amount on original principal amount after two years	2.50%
Senior Secured First-lien Revolving Credit Facility | Senior Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 50,000,000.0
Outstanding amount under credit facility				$ 0		$ 0
Net Leverage Ratio Greater Than 3.00 | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Net leverage ratio	3.00
Unused line fee percentage	50.00%
Net Leverage Ratio Greater Than 3.00 | Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	3.00%
Net Leverage Ratio Greater Than 3.00 | Amended Senior Credit Facilities | Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	2.00%
Net Leverage Ratio Less Than or Equal to 3.00 but Greater Than 2.50 | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Unused line fee percentage	45.00%
Net Leverage Ratio Less Than or Equal to 3.00 but Greater Than 2.50 | Amended Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Net leverage ratio	3.00
Net Leverage Ratio Less Than or Equal to 3.00 but Greater Than 2.50 | Amended Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Net leverage ratio	2.50
Net Leverage Ratio Less Than or Equal to 3.00 but Greater Than 2.50 | Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	2.75%
Net Leverage Ratio Less Than or Equal to 3.00 but Greater Than 2.50 | Amended Senior Credit Facilities | Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	1.75%
Net Leverage Ratio Less Than or Equal to 2.50 but Greater Than 2.00 | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Unused line fee percentage	40.00%
Net Leverage Ratio Less Than or Equal to 2.50 but Greater Than 2.00 | Amended Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Net leverage ratio	2.50
Net Leverage Ratio Less Than or Equal to 2.50 but Greater Than 2.00 | Amended Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Net leverage ratio	2.00
Net Leverage Ratio Less Than or Equal to 2.50 but Greater Than 2.00 | Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	2.50%
Net Leverage Ratio Less Than or Equal to 2.50 but Greater Than 2.00 | Amended Senior Credit Facilities | Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	1.50%
Net Leverage Ratio Less Than or Equal to 2.00 but Greater Than 1.50 | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Unused line fee percentage	35.00%
Net Leverage Ratio Less Than or Equal to 2.00 but Greater Than 1.50 | Amended Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Net leverage ratio	2.00
Net Leverage Ratio Less Than or Equal to 2.00 but Greater Than 1.50 | Amended Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Net leverage ratio	1.50
Net Leverage Ratio Less Than or Equal to 2.00 but Greater Than 1.50 | Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	2.25%
Net Leverage Ratio Less Than or Equal to 2.00 but Greater Than 1.50 | Amended Senior Credit Facilities | Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	1.25%
Net Leverage Ratio Less Than or Equal to 1.50 | Amended Senior Credit Facilities
Debt Instrument [Line Items]
Net leverage ratio	1.50
Unused line fee percentage	30.00%
Net Leverage Ratio Less Than or Equal to 1.50 | Amended Senior Credit Facilities | LIBOR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	2.20%
Net Leverage Ratio Less Than or Equal to 1.50 | Amended Senior Credit Facilities | Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate	1.00%