Ownership Percentage (Details)	Jun. 30, 2020	Mar. 31, 2020
PQ Silicates Ltd.
Schedule of Equity Method Investments
Ownership percentage	50.00%
Zeolyst International
Schedule of Equity Method Investments
Ownership percentage	50.00%
Zeolyst C.V.
Schedule of Equity Method Investments
Ownership percentage	50.00%
Asociacion para el Estudio de las Tecnologias de Equipamiento de Carreteras, S.A. (“Aetec”)
Schedule of Equity Method Investments
Ownership percentage	20.00%
Quaker Holdings
Schedule of Equity Method Investments
Ownership percentage		49.00%