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v3.21.1

Earnings Per Share (Narrative) (Details) - shares | Mar. 31, 2021 | Mar. 31, 2020
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Performance Based Right to Receive Common Shares [Member] |  |
Common shares, non-vested | 778,199 | 789,027

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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=120381028&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: |