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Share-based Payments - Performance Stock Units (Details) - Performance Stock Units [Member]	6 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Performance Stock Units ("PSUs") [Abstract]
Vesting period	3 years
Monte Carlo valuation model assumptions used in determining the fair value of the TSR awards [Abstract]
Risk free interest rate	0.47%
Expected life in years	3 years
Expected volatility of MPA common stock	53.70%
Expected average volatility of peer companies	59.30%
Average correlation coefficient of peer companies	26.70%
Expected dividend yield	0.00%
Grant date fair value (in dollars per share)	$ 26.89
Number of Shares [Roll Forward]
Non-vested at beginning of period (in shares) | shares	0
Granted (in shares) | shares	84,593
Vested (in shares) | shares	0
Forfeited (in shares) | shares	0
Non-vested at end of period (in shares) | shares	84,593
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested at beginning of period (in dollars per share)	$ 0
Granted (in dollars per share)	23.19
Vested (in dollars per share)	0
Forfeited (in dollars per share)	0
Non-vested at end of period (in dollars per share)	$ 23.19
Total unrecognized compensation expense | $	$ 1,774,000
Weighted average remaining vesting period over which compensation expense is expected to be recognized	2 years 8 months 12 days
Minimum [Member]
Performance Stock Units ("PSUs") [Abstract]
Awards vesting target percentage	0.00%
Maximum [Member]
Performance Stock Units ("PSUs") [Abstract]
Awards vesting target percentage	150.00%

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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