Note 7 - Goodwill - Changes to Goodwill (Details) $ in Thousands	3 Months Ended
Sep. 30, 2018 USD ($)
Goodwill	$ 211,751
Beginning balance, goodwill	211,751
Acquisition	53,437
Translation adjustment	(2,167)
Ending balance, goodwill	263,021
Previously Reported [Member]
Goodwill	251,762
Beginning balance, goodwill	251,762
Restatement Adjustment [Member]
Goodwill	(40,011)
Beginning balance, goodwill	(40,011)
Food Service Equipment Group [Member]
Goodwill	23,453
Beginning balance, goodwill	23,453
Acquisition
Translation adjustment
Ending balance, goodwill	23,453
Food Service Equipment Group [Member] \| Previously Reported [Member]
Goodwill	63,464
Beginning balance, goodwill	63,464
Food Service Equipment Group [Member] \| Restatement Adjustment [Member]
Goodwill	(40,011)
Beginning balance, goodwill	(40,011)
Engraving Group [Member]
Goodwill	26,697
Beginning balance, goodwill	26,697
Acquisition	33,295
Translation adjustment	(76)
Ending balance, goodwill	59,916
Engraving Group [Member] \| Previously Reported [Member]
Goodwill	26,697
Beginning balance, goodwill	26,697
Engraving Group [Member] \| Restatement Adjustment [Member]
Goodwill
Beginning balance, goodwill
Engineering Technologies Group [Member]
Goodwill	44,247
Beginning balance, goodwill	44,247
Acquisition
Translation adjustment	(123)
Ending balance, goodwill	44,124
Engineering Technologies Group [Member] \| Previously Reported [Member]
Goodwill	44,247
Beginning balance, goodwill	44,247
Engineering Technologies Group [Member] \| Restatement Adjustment [Member]
Goodwill
Beginning balance, goodwill
Electronics Products Group [Member]
Goodwill	113,798
Beginning balance, goodwill	113,798
Acquisition	20,142
Translation adjustment	(1,863)
Ending balance, goodwill	132,077
Electronics Products Group [Member] \| Previously Reported [Member]
Goodwill	113,798
Beginning balance, goodwill	113,798
Electronics Products Group [Member] \| Restatement Adjustment [Member]
Goodwill
Beginning balance, goodwill
Hydraulics Products Group [Member]
Goodwill	3,059
Beginning balance, goodwill	3,059
Acquisition
Translation adjustment
Ending balance, goodwill	3,059
Hydraulics Products Group [Member] \| Previously Reported [Member]
Goodwill	3,059
Beginning balance, goodwill	3,059
Hydraulics Products Group [Member] \| Restatement Adjustment [Member]
Goodwill
Beginning balance, goodwill
Corporate and Other [Member]
Goodwill	497
Beginning balance, goodwill	497
Acquisition
Translation adjustment	(105)
Ending balance, goodwill	392
Corporate and Other [Member] \| Previously Reported [Member]
Goodwill	497
Beginning balance, goodwill	497
Corporate and Other [Member] \| Restatement Adjustment [Member]
Goodwill
Beginning balance, goodwill

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RestatementAxis=srt_RestatementAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sxi_FoodServiceEquipmentGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sxi_EngravingGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sxi_EngineeringTechnologiesGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sxi_ElectronicsProductsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sxi_HydraulicsProductsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: