CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Sep. 30, 2020	$ 960,071	$ 369	$ 974,307	$ (18,316)	$ 3,711
Balance (in shares) at Sep. 30, 2020		36,842
Net income (loss)	32,104			32,104
Other comprehensive income (loss)	1,923				1,923
Issuance of common stock	5,045	$ 14	5,031
Issuance of common stock, (in shares)		1,390
Stock withheld to cover tax withholdings requirements upon stock vesting	(32,200)	$ (4)	(32,196)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(452)
Stock-based compensation	36,498		36,498
Balance at Mar. 31, 2021	1,003,441	$ 379	983,640	13,788	5,634
Balance (in shares) at Mar. 31, 2021		37,780
Balance at Dec. 31, 2020	995,720	$ 378	974,866	2,625	17,851
Balance (in shares) at Dec. 31, 2020		37,685
Net income (loss)	11,163			11,163
Other comprehensive income (loss)	(12,217)				(12,217)
Issuance of common stock	1,382	$ 1	1,381
Issuance of common stock, (in shares)		114
Stock withheld to cover tax withholdings requirements upon stock vesting	(1,942)		(1,942)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(19)
Stock-based compensation	9,335		9,335
Balance at Mar. 31, 2021	1,003,441	$ 379	983,640	13,788	5,634
Balance (in shares) at Mar. 31, 2021		37,780
Balance at Sep. 30, 2021	1,031,945	$ 381	1,002,353	27,577	1,634
Balance (in shares) at Sep. 30, 2021		38,025
Net income (loss)	18,568			18,568
Other comprehensive income (loss)	(10,717)				(10,717)
Issuance of common stock	34,840	$ 13	34,827
Issuance of common stock, (in shares)		1,425
Stock withheld to cover tax withholdings requirements upon stock vesting	(47,826)	$ (1)	(47,825)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(145)
Stock-based compensation	29,376		29,376
Balance at Mar. 31, 2022	1,056,186	$ 393	1,018,731	46,145	(9,083)
Balance (in shares) at Mar. 31, 2022		39,305
Balance at Dec. 31, 2021	1,049,501	$ 392	1,006,205	46,621	(3,717)
Balance (in shares) at Dec. 31, 2021		39,162
Net income (loss)	(476)			(476)
Other comprehensive income (loss)	(5,366)				(5,366)
Issuance of common stock	2,701	$ 1	2,700
Issuance of common stock, (in shares)		144
Stock withheld to cover tax withholdings requirements upon stock vesting	(1,538)		(1,538)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(1)
Stock-based compensation	11,364		11,364
Balance at Mar. 31, 2022	$ 1,056,186	$ 393	$ 1,018,731	$ 46,145	$ (9,083)
Balance (in shares) at Mar. 31, 2022		39,305