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v3.19.3

Earnings Per Share (Narrative) (Details) - shares | Sep. 30, 2019 | Sep. 30, 2018
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Performance Based Right to Receive Common Shares [Member] |  |
Common shares, non-vested | 578,966 | 626,500

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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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
Name: | us-gaap_PlanNameAxis=sri_PerformanceBasedRightToReceiveCommonSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |