XML 142 R105.htm IDEA: XBRL DOCUMENT v3.8.0.1

Retirement plans - Asset allocation (Details)	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits [Abstract]
Equity securities	46.00%	49.00%
Debt securities	29.00%	27.00%
Cash and other short-term securities	25.00%	24.00%
Total	100.00%	100.00%

X

- Definition

Cash And Cash Equivalents, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	mx_CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	mx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	mx_DebtInstrumentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	mx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Employee Benefits [Abstract]

+ References

No definition available.

+ Details

Name:	mx_EmployeeBenefitsAbstract
Namespace Prefix:	mx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	mx_EquityInstrumentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	mx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Plan Assets At Fair Value, Allocation Percentage

+ References

No definition available.

+ Details

Name:	mx_PlanAssetsAtFairValueAllocationPercentage
Namespace Prefix:	mx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant