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Investments - Additional Information (Detail) (U. S. Treasury Bills [Member])	3 Months Ended	12 Months Ended
	Aug. 31, 2013	May 31, 2013
U. S. Treasury Bills [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment maturity period	3 months	3 months

X

- Definition

Investment securities maturity period.

+ References

No definition available.

+ Details

Name:	sky_InvestmentSecuritiesMaturityPeriod
Namespace Prefix:	sky_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration