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Lease Obligations - Summary of the lease terms and discount rates (Details)
Sep. 30, 2019
Lease Obligations  
Weighted-average remaining lease term - finance leases 1 year 7 months 6 days
Weighted-average remaining lease term - operating leases 4 years 1 month 6 days
Weighted-average discount rate - finance leases 2.50%
Weighted-average discount rate - operating leases 3.80%