Current Assets and Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Receivables
Balance at beginning of year	$ 3,810	$ 3,538	$ 2,777
Charged to expense	1,552	1,424	2,022
Accounts written off	(1,199)	(1,152)	(1,261)
Balance at end of year	4,163	3,810	3,538
Inventories
Raw materials	22,333	12,831
Finished goods	50,335	42,243
Inventories	72,668	55,074
Increase in inventories	432	1,007	2,347
Warranty Liabilities
Balance at beginning of year	6,768	7,219	2,141
Charged to expense	1,393	2,020	1,992
Changes to prior year estimates	(265)	(461)	32
Additions from acquisitions	3,093		4,842
Payments for claims	(1,651)	(2,010)	(1,788)
Balance at end of year	9,338	6,768	$ 7,219
Other Accrued Liabilities
Products and services received but not yet invoiced	25,609	24,215
Acquisition liabilities	12,400	400
Other	25,776	27,166
Other Accrued Liabilities, Current	63,785	$ 51,781
Acquisitions 2016
Inventories
Increase in inventories	$ 16,500