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GEOGRAPHIC INFORMATION - Net Sales and Long Lived Assets by Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 126,788us-gaap_SalesRevenueNet	$ 104,168us-gaap_SalesRevenueNet
Long Lived Assets	43,959us-gaap_NoncurrentAssets		43,669us-gaap_NoncurrentAssets
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	108,450us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember	82,769us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Long Lived Assets	41,620us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember		41,176us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	18,338us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlr_ForeignMember	21,399us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = mlr_ForeignMember
Long Lived Assets	$ 2,339us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember		$ 2,493us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mlr_ForeignMember

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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