Capital Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 299,026	$ 296,643
Accumulated Amortization	(51,950)	(41,564)
Intangible assets, net	$ 247,076	$ 255,079
Weighted Average Useful Life (in Years)	15 years	15 years
Software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 28,445	$ 26,083
Accumulated Amortization	(15,859)	(15,830)
Net Carrying Value	$ 12,586	$ 10,253
Weighted Average Useful Life (in Years)	6 years 8 months 20 days	5 years 11 months
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 46,777	$ 46,731
Accumulated Amortization	(11,683)	(9,399)
Net Carrying Value	$ 35,094	$ 37,332
Weighted Average Useful Life (in Years)	14 years 10 months 24 days	14 years 10 months 24 days
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,962	$ 6,936
Accumulated Amortization	(2,916)	(2,484)
Net Carrying Value	$ 4,046	$ 4,452
Weighted Average Useful Life (in Years)	25 years 6 months 25 days	25 years 7 months
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 156,960	$ 157,016
Accumulated Amortization	(20,814)	(13,359)
Net Carrying Value	$ 136,146	$ 143,657
Weighted Average Useful Life (in Years)	15 years 9 months 18 days	15 years 9 months 18 days
Land-use rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,382	$ 2,377
Accumulated Amortization	(678)	(492)
Net Carrying Value	$ 1,704	$ 1,885
Weighted Average Useful Life (in Years)	26 years 4 months 15 days	26 years 4 months 15 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 57,500	$ 57,500