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Investments (Details Textual) (U. S. Treasury Bills [Member])	Aug. 31, 2012	May 31, 2012
U. S. Treasury Bills [Member]
Investments (Textual) [Abstract]
Investment maturity period	3 months	4 months

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- Definition

Investment maturity period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sky_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	sky_InvestmentsTextualAbstract
Namespace Prefix:	sky_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration