Contracts with Customers (Details) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($) segment
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment	3
Warranty period	12 months
Period of contract	1 year
Amortization period	1 year
Deferred gross profit | $	$ 0.5
Semiconductor | Minimum
Disaggregation of Revenue [Line Items]
Percentage of contract price	80.00%
Semiconductor | Maximum
Disaggregation of Revenue [Line Items]
Percentage of contract price	90.00%
Down Payment | Solar | Minimum
Disaggregation of Revenue [Line Items]
Percentage of contract price	20.00%
Down Payment | Solar | Maximum
Disaggregation of Revenue [Line Items]
Percentage of contract price	30.00%
Second Payment | Solar | Minimum
Disaggregation of Revenue [Line Items]
Percentage of contract price	40.00%
Second Payment | Solar | Maximum
Disaggregation of Revenue [Line Items]
Percentage of contract price	50.00%
Final Payment | Solar | Minimum
Disaggregation of Revenue [Line Items]
Percentage of contract price	10.00%
Final Payment | Solar | Maximum
Disaggregation of Revenue [Line Items]
Percentage of contract price	20.00%
Equipment Sales | Minimum
Disaggregation of Revenue [Line Items]
Warranty period	12 months
Equipment Sales | Maximum
Disaggregation of Revenue [Line Items]
Warranty period	24 months