Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended			1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2013 sqft	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013	May 31, 2013 2017 [Member]	Oct. 31, 2013 Indemnification Agreement [Member]	Jan. 31, 2013 Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Net operating lease expenses		$ 1,200,000	$ 1,100,000	$ 3,600,000	$ 3,200,000
Lease agreement rental area in square feet	35,000
Initial lease term	5 years
Lease termination year	2018-04
Monthly basic rent obligation		44,550					65,400
Average monthly basic rent expense		59,800
Total manufacturing purchase commitments		12,400,000		12,400,000		15,100,000
Payments under indemnification obligations								0	0
Liabilities recorded under indemnification obligations								$ 0	$ 0