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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Nov. 30, 2012 Maximum	Jan. 31, 2013 Subsequent Event
Stockholders Equity Note [Line Items]
Stock repurchase program, authorized			$ 15.0
Stock repurchased, shares	800,000	800,000		323,587
Stock repurchased, value	10.7	10.7		4.4
Average cost of stock repurchased, per share	$ 13.32	$ 13.32
Stock repurchase program, completed amount	$ 15.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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