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Retirement and Death Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Retirement Benefits [Abstract]
Employee retirement or disability, period over which benefits are to be paid	10 years
Life insurance contracts, discounting rate for present value calculation	4.00%	4.00%
Life insurance contracts, current and non current amounts recognized in balance Sheet	$ 5,122,000	$ 5,340,000
Life insurance contracts, amount charged to operations		$ 10,000
Life insurance contracts, amount credited to operations	$ 17,000

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- Definition

Employee retirement or disability duration for benefits payable under arrangement.

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No definition available.

+ Details

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- Definition

Post retirement benefit plans insurance contracts amounts charged to operations.

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No definition available.

+ Details

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Namespace Prefix:	sky_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Post retirement benefit plans insurance contracts amounts credited to operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	sky_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Post retirement benefit plans insurance contracts amounts recognized in balance sheet.

+ References

No definition available.

+ Details

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Namespace Prefix:	sky_
Data Type:	xbrli:monetaryItemType
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- Definition

Post retirement benefit plans insurance contracts present value discounting rate.

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No definition available.

+ Details

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Namespace Prefix:	sky_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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