Canadian Customs Duty Examination (Detail Textuals) - CBSA $ in Millions, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 CAD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 CAD ($)
Canadian Customs Duty Examination [Line Items]
Value of bond issued for prepayments of additional duties	$ 20.9	$ 26.9
Amendment in prepayments of additional duties	$ 1.1	$ 1.4
Deferred higher dutiable value			$ 1.9	$ 2.5	$ 6.4	$ 8.4