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Summary of Significant Accounting Policies (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Dec. 27, 2014
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Sep. 27, 2014
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Jun. 28, 2014
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Mar. 29, 2014
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Dec. 28, 2013
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Sep. 28, 2013
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Jun. 29, 2013
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Mar. 30, 2013
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Dec. 27, 2014
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Dec. 28, 2013
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Dec. 29, 2012
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| Property, Plant and Equipment [Line Items] |
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| Reinsurance Purchased For Stop Losses On Individual Basis |
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$ 155snhy_ReinsurancePurchasedForStopLossesOnIndividualBasis |
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| Computation of basic and diluted earnings per common share |
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| Net income |
10,327,000us-gaap_NetIncomeLoss |
9,877,000us-gaap_NetIncomeLoss |
12,186,000us-gaap_NetIncomeLoss |
11,385,000us-gaap_NetIncomeLoss |
8,343,000us-gaap_NetIncomeLoss |
8,275,000us-gaap_NetIncomeLoss |
11,790,000us-gaap_NetIncomeLoss |
9,575,000us-gaap_NetIncomeLoss |
43,775,000us-gaap_NetIncomeLoss |
37,984,000us-gaap_NetIncomeLoss |
37,398,000us-gaap_NetIncomeLoss |
| Weighted average basic shares outstanding |
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26,456us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
26,206us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
25,944us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
| Basic net income per common share (in dollars per share) |
$ 0.39us-gaap_EarningsPerShareBasic |
$ 0.37us-gaap_EarningsPerShareBasic |
$ 0.46us-gaap_EarningsPerShareBasic |
$ 0.43us-gaap_EarningsPerShareBasic |
$ 0.32us-gaap_EarningsPerShareBasic |
$ 0.32us-gaap_EarningsPerShareBasic |
$ 0.45us-gaap_EarningsPerShareBasic |
$ 0.37us-gaap_EarningsPerShareBasic |
$ 1.65us-gaap_EarningsPerShareBasic |
$ 1.45us-gaap_EarningsPerShareBasic |
$ 1.44us-gaap_EarningsPerShareBasic |
| Effect of dilutive stock options |
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0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
| Weighted average diluted shares outstanding |
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26,456us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
26,206us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
25,971us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
| Diluted net income per common share (in dollars per share) |
$ 0.39us-gaap_EarningsPerShareDiluted |
$ 0.37us-gaap_EarningsPerShareDiluted |
$ 0.46us-gaap_EarningsPerShareDiluted |
$ 0.43us-gaap_EarningsPerShareDiluted |
$ 0.32us-gaap_EarningsPerShareDiluted |
$ 0.32us-gaap_EarningsPerShareDiluted |
$ 0.45us-gaap_EarningsPerShareDiluted |
$ 0.37us-gaap_EarningsPerShareDiluted |
$ 1.65us-gaap_EarningsPerShareDiluted |
$ 1.45us-gaap_EarningsPerShareDiluted |
$ 1.44us-gaap_EarningsPerShareDiluted |
| Reinsurance Purchased For Stop Losses on Aggregate Basis |
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$ 7,200snhy_ReinsurancePurchasedForStopLossesonAggregateBasis |
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| Computer Equipment [Member] | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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3 years |
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| Computer Equipment [Member] | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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5 years |
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| Machinery and equipment | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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4 years |
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| Machinery and equipment | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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12 years |
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| Furniture and Fixtures [Member] | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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4 years |
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| Furniture and Fixtures [Member] | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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10 years |
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| Buildings | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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25 years |
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| Buildings | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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40 years |
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| Leasehold and land improvements | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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5 years |
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| Leasehold and land improvements | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Estimated useful life |
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15 years |
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