Annual report pursuant to Section 13 and 15(d)

Goodwill and intangible assets - Additional Information (Detail)

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Goodwill and intangible assets - Additional Information (Detail) (USD $)
12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Cost of Sales
     
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 890,000 $ 435,000 $ 435,000
Selling, General and Administrative Expense
     
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 574,000 $ 525,000 $ 525,000