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Interest Rate Swap Agreements - Summary of average variable rates received and average fixed rates paid under the swap (Details 2) (Swap) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Swap |  |
Derivative [Line Items] |  |
Average variable rate received | 0.22% | 0.00%
Average fixed rate paid | 0.94% | 0.00%

X
- 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

X
- 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