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Basis of Presentation Shares Repurchases (Details) - USD ($) $ in Millions	Sep. 30, 2017	Aug. 01, 2017	Aug. 19, 2016
Shares Repurchases [Abstract]
Stock Repurchased During the Period	35,887
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 20.0
Stock Repurchase Program, Authorized Amount		$ 275.0	$ 125.0
Authorized Amount Increase Under Share Repurchase Program		$ 150.0

X

- Definition

Represent authorized amount increase under Share Repurchase Program

+ References

No definition available.

+ Details

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Namespace Prefix:	ssd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Shares Repurchases [Abstract]

+ References

No definition available.

+ Details

Name:	ssd_SharesRepurchasesAbstract
Namespace Prefix:	ssd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represent number of shares that have been repurchased during the period under ASR program

+ References

No definition available.

+ Details

Name:	ssd_StockRepurchasedDuringthePeriod
Namespace Prefix:	ssd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

+ Details

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

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant