Pension and Other Postretirement Benefits - Contributions to Plans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Retirement Benefits [Abstract]
Contributions made during the period	$ 1,615	$ 1,902	$ 3,180	$ 3,491
Contributions expected for the remainder of the fiscal year			3,942	3,756
Total			$ 7,122	$ 7,247

Defined Benefit Plan, Plan Assets, Contributions Expected for Remainder of Fiscal Year

No definition available.

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Namespace Prefix:	pyx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration