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Note 2 - Acquisitions (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Aug. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 96,828,000	$ 10,397,000
Goodwill, Ending Balance	$ 263,021,000			263,021,000		$ 263,021,000	$ 211,751,000
Agile Magnetics [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	39,193,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	13,718,000			13,718,000		13,718,000
Goodwill, Ending Balance	20,142,000			20,142,000		20,142,000
Agile Magnetics [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	7,800,000			7,800,000		7,800,000
Agile Magnetics [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	5,900,000			5,900,000		5,900,000
Tenibac-Graphion, Inc. [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	56,726,000		$ 57,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	15,960,000		16,000,000	15,960,000		15,960,000
Goodwill, Ending Balance	32,949,000		32,900,000	32,949,000		32,949,000
Tenibac-Graphion, Inc. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			$ 10,400,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Tenibac-Graphion, Inc. [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			$ 4,200,000
Tenibac-Graphion, Inc. [Member] | Other Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			$ 1,400,000
Piazza Rosa Group [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 10,056,000		900,000	10,100,000	12,673,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	3,472,000	4,087,000		3,472,000	4,087,000	3,472,000
Goodwill, Ending Balance	7,076,000	6,218,000		7,076,000	6,218,000	7,076,000
Other Payments to Acquire Businesses					2,800,000	2,617,000
Goodwill, Purchase Accounting Adjustments				900,000		858,000
Piazza Rosa Group [Member] | Trademarks (Indefinite-Lived) [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		1,600,000			1,600,000
Piazza Rosa Group [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		2,300,000			$ 2,300,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					8 years
Piazza Rosa Group [Member] | Other Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		$ 200,000			$ 200,000
Horizon Scientific Inc. [Member]
Business Combination, Deferred Compensation Due on Second Anniversary	3,000,000			3,000,000		3,000,000
Business Combination, Deferred Compensation Due on Third Anniversary	$ 5,600,000			5,600,000		$ 5,600,000
Business Combination, Deferred Compensation Arrangements				$ 700,000

X

- Definition

This element represents acquisition-related costs incurred due to the effect of deferred compensation arrangements made in the course of the acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	sxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of acquisition-related costs incurred as a result of deferred compensation arrangements due on the second anniversary.

+ References

No definition available.

+ Details

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Namespace Prefix:	sxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of acquisition-related costs incurred as a result of deferred compensation arrangements due on the third anniversary.

+ References

No definition available.

+ Details

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Namespace Prefix:	sxi_
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X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Section 45
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X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
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X

- Definition

The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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