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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 3) (Swap)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Swap
Derivative [Line Items]
Variable rate received	0.19%	0.24%	0.19%	0.24%
Fixed rate paid	0.94%	0.95%	0.94%	0.96%

X

- Definition

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

+ References

No definition available.

+ Details

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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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