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Earnings Per Share (Narative) (Details) - shares | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Performance Based Restricted Common Shares [Member] |  |
Common shares, non-vested | 0 | 134,250
Performance Based Right to Receive Common Shares [Member] |  |
Common shares, non-vested | 843,140 | 573,885

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=sri_PerformanceBasedRightToReceiveCommonSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |