Line of credit amortization.

No definition available.

Name:	snhy_LineOfCreditAmortization
Namespace Prefix:	snhy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line of credit facility accordion feature increase to maximum borrowing capacity.

+ References

No definition available.

+ Details

Name:	snhy_LineOfCreditFacilityAccordionFeatureIncreaseToMaximumBorrowingCapacity
Namespace Prefix:	snhy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility, ratio of interest coverage.

+ References

No definition available.

+ Details

Name:	snhy_LineOfCreditFacilityRatioOfInterestCoverage
Namespace Prefix:	snhy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of credit facilities.

+ References

No definition available.

+ Details

Name:	snhy_NumberOfCreditFacilities
Namespace Prefix:	snhy_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentIssuanceDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=snhy_UnsecuredRevolvingLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=snhy_SwingLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=snhy_EuroRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt (Details Textual)				9 Months Ended
Long-Term Debt (Details Textual)	Oct. 01, 2016 USD ($) CreditFacility	Jul. 29, 2016 USD ($)	Aug. 01, 2011 USD ($) CreditFacility	Oct. 01, 2016 USD ($)	Sep. 26, 2015 USD ($)
Debt Instrument [Line Items]
Credit facilities, maximum capacity			$ 50,000,000
Line of Credit Amortization				$ 0	$ 0
Effective date			Aug. 01, 2011
Number Of Credit Facilities \| CreditFacility	0		3
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity	$ 35,000,000			35,000,000
Unsecured Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity	15,000,000			15,000,000
Secured Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity	15,000,000			$ 15,000,000
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Amortization	$ 0
Line of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity		$ 100,000,000
Accordion feature to increase maximum capacity		$ 75,000,000
Interest coverage ratio (percent)		3.00%
Leverage ratio (percent)		3.5
Line of Credit [Member] \| Swing Loans [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity		$ 15,000,000
Line of Credit [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facilities, maximum capacity		$ 5,000,000
Line of Credit [Member] \| Minimum [Member] \| Euro Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate (percent)		1.25%
Line of Credit [Member] \| Minimum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate (percent)		0.25%
Line of Credit [Member] \| Maximum [Member] \| Euro Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate (percent)		2.00%
Line of Credit [Member] \| Maximum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate (percent)		1.00%