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

No definition available.

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

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation Shares Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Oct. 29, 2018	Sep. 30, 2018	Mar. 31, 2018	Aug. 01, 2017
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During the Period		802,565	182,171
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 50.0
Stock Repurchase Program, Authorized Amount		$ 49.5		$ 275.0
Treasury Stock Acquired, Average Cost Per Share		$ 61.67
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During the Period	528,100
Stock Repurchase Program, Authorized Amount	$ 36.0
Represents available for share repurchase	$ 65.4
Treasury Stock Acquired, Average Cost Per Share	$ 68.26