Income Taxes (Tables)

12 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Components of Income Tax Provision (Benefit)

	Year Ended September 30,
	2019		2018		2017
Current income tax provision (benefit):
Federal	$	963	$	—	$	—
State		510		917		402
Foreign		15,860		7,608		7,499
Total current income tax provision		17,333		8,525		7,901
Deferred income tax provision (benefit):
Federal		(8,633)		(48,815)		(4,247)
State		(2,138)		(5,518)		(249)
Foreign		(6,673)		(1,443)		(25)
Total deferred income tax provision (benefit)		(17,444)		(55,776)		(4,521)
Income tax provision (benefit)	$	(111)	$	(47,251)	$	3,380

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

	Year Ended September 30,
	2019		2018		2017
Domestic	$	(37,160)	$	3,122	$	(13,211)
Foreign		46,603		17,344		27,731
	$	9,443	$	20,466	$	14,520

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

	Year Ended September 30,
	2019		2018		2017
Income tax provision computed at federal statutory rate	$	1,983	$	5,014	$	4,923
State income taxes, net of federal benefit		(630)		692		137
Foreign income taxed at different rates		550		920		(1,644)
Impact of investments in subsidiaries		(536)		(729)		(965)
Change in deferred tax asset valuation allowance		(2,264)		(75,918)		319
Net increase (reduction) in uncertain tax positions		720		220		731
Global intangible low taxed income, net of foreign tax credits		942		—		—
Impact of U.S. federal tax rate change		—		15,287		—
Compensation		(1,103)		(701)		579
Tax credits		(2,741)		(1,633)		(1,151)
Merger costs		572		1,405		—
Other taxes		764		70		98
Non-deductible expenses		174		176		220
Transition tax		2,836		8,027		—
Deferred state rate change due to acquisition		(1,360)		—		—
Other		(18)		(81)		133
Income tax provision (benefit)	$	(111)	$	(47,251)	$	3,380

Significant Components of Net Deferred Tax Assets and Liabilities

	September 30,
	2019		2018
Accruals and reserves not currently deductible	$	14,286	$	11,699
Federal, state and foreign tax credits		5,952		27,923
Other assets		2,487		175
Equity compensation		5,360		5,926
Net operating loss carryforwards		18,987		16,790
Deferred revenue		4,038		2,882
Inventory reserves and valuation		5,626		6,520
Deferred tax assets		56,736		71,915
Depreciation and intangible amortization		(57,634)		(19,476)
Deferred tax liabilities		(57,634)		(19,476)
Valuation allowance		(16,093)		(18,581)
Net deferred tax asset (liability)	$	(16,991)	$	33,858

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

	Total
Balance at September 30, 2016	$	5,427
Additions for tax positions in current year		1,869
Reduction for tax positions in prior year		(3,485)
Net reductions from lapses in statutes of limitations		(431)
Foreign exchange rate adjustment		(2)
Balance at September 30, 2017		3,378
Additions for tax positions in current year		874
Reduction for tax positions in prior year		(656)
Reductions from lapses in statutes of limitations		(353)
Balance at September 30, 2018		3,243
Additions for tax positions in current year		901
Additions for tax positions in prior year		13,400
Reductions from lapses in statutes of limitations		(68)
Reductions from settlements with taxing authorities		(166)
Balance at September 30, 2019	$	17,310