Subsequent Events (Details)	Feb. 28, 2020
Subsequent events
Target percentage for participants	12.75%
Term of change in Control Plan	10 years
Senior Management Team
Subsequent events
Target percentage for participants	7.75%
Barton Bandy
Subsequent events
Target percentage for participants	4.00%
Thomas Stankovich
Subsequent events
Target percentage for participants	1.25%
Other senior management team members as a group
Subsequent events
Target percentage for participants	2.50%
Board
Subsequent events
Target percentage for participants	5.00%
Dan Gladney
Subsequent events
Target percentage for participants	2.00%
Gary Blackford
Subsequent events
Target percentage for participants	1.00%
Lori McDougal
Subsequent events
Target percentage for participants	1.00%
Arda Minocherhomjee
Subsequent events
Target percentage for participants	1.00%