Organization and Significant Accounting Policies - Concentrations of Credit and Other Risk (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Concentration Risk [Line Items]
Tax Cuts & Jobs Act									$ 800
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	$ 1,382,818	$ 1,200,181	$ 757,338
Net sales | Electronics distributor risk
Concentration Risk [Line Items]
Concentration risk, percentage									42.20%	39.20%	46.80%
Net sales | Electronics distributor risk | TTI, Inc.
Concentration Risk [Line Items]
Number of customers									One	1	1
Net sales (1)									$ 184,300	$ 133,500	$ 104,400
Accounts receivable | Credit risk
Concentration Risk [Line Items]
Number of customers									0
Concentration risk, percentage									0.00%