XML 53 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
REVENUE RECOGNITION: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
Mar. 31, 2018
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 0.1
Copper | April 2018 to June 2018  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 45.5
Provisional price | $ / item 3.02
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 6.4
Molybdenum | April 2018 to June 2018  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 9.4
Provisional price | $ / item 12.63