Organization and Significant Accounting Policies - Concentrations of Credit and Other Risk (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Concentration Risk [Line Items]
Tax Cuts & Jobs Act									$ 800
Net sales	$ 318,047	$ 306,408	$ 301,471	$ 274,000	$ 197,519	$ 188,029	$ 187,308	$ 184,935	$ 1,199,926	$ 757,791	$ 734,823
Net sales | Electronics distributor risk
Concentration Risk [Line Items]
Concentration risk, percentage									39.20%	46.80%	41.90%
Net sales | Electronics distributor risk | TTI, Inc.
Concentration Risk [Line Items]
Number of customers									1	1	1
Net sales									$ 133,500	$ 104,400	$ 99,300
Accounts receivable | Credit risk
Concentration Risk [Line Items]
Number of customers									0
Concentration risk, percentage									0.00%