Income Taxes (Tables)

12 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Components of Income Tax Provision (Benefit)

	Year Ended September 30,
	2021		2020		2019
Current income tax provision (benefit):
Federal	$	(14,247)	$	661	$	543
State		(867)		375		360
Foreign		15,484		3,721		3,045
Total current income tax provision		370		4,757		3,948
Deferred income tax provision (benefit):
Federal		(11,469)		(11,833)		(16,071)
State		(2,283)		(1,976)		(5,503)
Foreign		(6,718)		(4,878)		(5,204)
Total deferred income tax benefit		(20,470)		(18,687)		(26,778)
Income tax benefit	$	(20,100)	$	(13,930)	$	(22,830)

Components of Income (Loss) Before Income Taxes and Equity in Earnings of Joint Ventures

	Year Ended September 30,
	2021		2020		2019
Domestic	$	(88,763)	$	(48,932)	$	(85,639)
Foreign		39,794		8,640		1,682
Income before income taxes	$	(48,969)	$	(40,292)	$	(83,957)

Differences between Income Tax Provision (benefit) and Income Taxes Computed using Applicable U.S. Statutory Federal Tax Rate

	Year Ended September 30,
	2021		2020		2019
Income tax benefit computed at federal statutory rate	$	(10,284)	$	(8,461)	$	(17,631)
State income taxes, net of federal benefit		(1,005)		(1,557)		(3,856)
Foreign income taxed at different rates		(2,594)		(1,786)		(1,408)
Impact of investments in subsidiaries		7,128		289		(536)
Change in deferred tax asset valuation allowance		(3,247)		(2,514)		(1,834)
Impact of change in uncertain tax positions		(10,607)		1,144		720
Global intangible low taxed income, net of foreign tax credits		4,051		2,815		393
Impact of tax rate changes		165		(185)		(1,440)
Compensation		462		(2,302)		(165)
Tax credits		(4,050)		(676)		(689)
Merger costs		20		37		593
Other taxes		468		398		432
Transition tax and other true-ups		—		(520)		2,909
Research and development expense deduction		(730)		(547)		(447)
Other		123		(65)		129
Income tax provision (benefit)	$	(20,100)	$	(13,930)	$	(22,830)

Significant Components of Net Deferred Tax Assets and Liabilities

	September 30,
	2021		2020
Accruals and reserves not currently deductible	$	17,272	$	15,761
Federal, state and foreign tax credits		4,350		5,627
Other assets		502		1,175
Equity compensation		5,872		4,115
Net operating loss carryforwards		9,693		12,583
Lease liabilities		12,958		6,508
Mergers		7,239		140
Deferred revenue		3,258		3,359
Inventory reserves and valuation		6,946		6,442
Deferred tax assets		68,090		55,710
Depreciation and intangible amortization		(50,181)		(53,474)
Right-of-use assets		(12,683)		(6,522)
Other liabilities		(1,883)		(464)
Deferred tax liabilities		(64,747)		(60,460)
Valuation allowance		(8,592)		(10,623)
Net deferred tax asset (liability)	$	(5,249)	$	(15,373)

Reconciliation of Beginning and Ending Amount of Consolidated Liability for Unrecognized Income Tax Benefits

	Total
Balance at September 30, 2018	$	2,655
Additions for tax positions in current year		873
Additions for tax positions in prior year		13,400
Reductions from lapses in statutes of limitations		(68)
Balance at September 30, 2019		16,860
Additions for tax positions in current year		448
Reductions from lapses in statutes of limitations		(586)
Balance at September 30, 2020		16,722
Reductions from lapses in statutes of limitations		(14,716)
Balance at September 30, 2021	$	2,006