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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 2) (Interest Rate Swap)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest Rate Swap
Derivative [Line Items]
Average variable rate received	0.18%	0.22%
Average fixed rate paid	0.94%	0.94%

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- 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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration