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Earnings (Loss) Per Share (Narative) (Details) - shares	Mar. 31, 2016	Mar. 31, 2015
Performance Based Restricted Common Shares [Member]
Common shares, non-vested	0	234,450
Performance Based Right to Received Common Shares [Member]
Common shares, non-vested	803,100	710,235

X

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PlanNameAxis=sri_PerformanceBasedRestrictedCommonSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=sri_PerformanceBasedRightToReceivedCommonSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: