Dividend amount per share of common stock

No definition available.

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Namespace Prefix:	ssi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage increase in quarterly cash dividend as approved by Board of Directors.

+ References

No definition available.

+ Details

Name:	ssi_PercentageIncreaseInQuarterlyDividend
Namespace Prefix:	ssi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
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

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Dec. 16, 2015	Oct. 31, 2015	Jun. 16, 2015	May. 02, 2015
Equity [Abstract]
Percentage increase in quarterly dividend			7.00%
Quarterly dividend rate (in dollars per share)		$ 0.15		$ 0.14
Stock Repurchase Program, Authorized Amount		$ 200.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 99.9
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Nov. 19, 2015
Dividends Payable, Amount Per Share (in dollars per share)	$ 0.15
Dividends Payable, Date to be Paid	Dec. 16, 2015
Dividends Payable, Date of Record	Dec. 01, 2015