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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 1) (Interest Rate Swap) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Interest Rate Swap |  |
Derivative [Line Items] |  |
Average variable rate received | 0.16%nick_DerivativeAverageVariableInterestRateReceived / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember | 0.18%nick_DerivativeAverageVariableInterestRateReceived / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Average fixed rate paid | 0.94%nick_DerivativeAverageFixedInterestRatePaid / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember | 0.94%nick_DerivativeAverageFixedInterestRatePaid / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember

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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | nick_DerivativeAverageFixedInterestRatePaid
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Average variable interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | nick_DerivativeAverageVariableInterestRateReceived
Namespace Prefix: | nick_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration