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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 1) - Interest Rate Swap | 2 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 30, 2012 | Jun. 04, 2012 | Mar. 31, 2016 | Mar. 31, 2015
Derivative [Line Items] |  |  |  |
Average variable rate received |  |  | 0.26% | 0.16%
Average fixed rate paid | 0.87% | 1.00% | 0.94% | 0.94%

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

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- 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
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |