XML 120 R106.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Tax Years Subject To Examination (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016
Internal Revenue Service IRS [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2015
California Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2012
Ohio Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2012
North Carolina Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2010
Oregon Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2013
Pennsylvania Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2013
China Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2013
Poland Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2010
United Kingdom Tax [Member] |
Income Tax Examination [Line Items] |
Earliest Tax Year Open To Examination | 2014

X
- Definition The earliest tax year still open to audit by the income tax examination authorities + References No definition available. + Details
Name: | ati_EarliestTaxYearOpenToExamination
Namespace Prefix: | ati_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_OH
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_NC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_OR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=stpr_PA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=country_PL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |