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Inventories - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Jun. 30, 2013
Inventory Disclosure [Abstract]        
Impact of net income under inventory valuation LIFO method $ (903,000) $ (383,000) $ 383,000 $ 903,000